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Federal investigators have cleared two doctors in California and Texas of any wrongdoing in the death of actor Heath Ledger.

The Drug Enforcement Agency interviewed the doctors earlier this week about prescriptions found in Ledger’s apartment and determined they did not prescribe him the two most powerful drugs – Oxycontin and Vicodin, the New York Post reports. The doctors did meet with Ledger but prescribed him other medications, according to investigators.

Ledger, 28, died on Jan. 22 in his Manhattan apartment from an accidental overdose of prescription drugs. Soon after the medical examiner released his cause of death, the DEA issued subpoenas to try to determine if there were medical conditions attached to all the drugs found in his apartment. That investigation is still ongoing.

Besides Oxycodone and Vicodin (also known as Hydrocodone), autopsy results also showed that Ledger’s system contained Diazepam (commonly called Valium), as well as Temazepam, which treats anxiety or sleeplessness; Alprazolam (also known as Xanax); and Doxylamine, a sedating antihistamine often used as a sleeping aid.

Michelle Williams – Ledger’s former girlfriend and mother of his 2-year-old daughter, Matilda – joined Ledger’s family and hundreds of mourners Feb. 9 at a memorial in Australia for the actor. On Jan. 26, a private memorial in Los Angeles was held for close friends and family.

Britney Spears is spending more quality time with her sons.

Preston, 2, and Jayden, 17 months, spent more time at their mother’s house on Wednesday morning – the third visit Spears has had with her children since lawyers for the singer and her ex-husband Kevin Federline reached a visitation agreement on Feb. 22.

Spears’s recent visits with her boys have been full of hugs and affection. “Kids this age are amazingly resilient, and the very close bond that Britney has with her children is apparent,” a source says.

On Saturday, Spears reunited with her sons for the first time since she was hospitalized at Cedars-Sinai Medical Center Jan. 3. She also had another visit with them Monday.

According to the source, Spears’s father, Jamie, and psychiatrist Dr. Lee Sadja have been monitoring the visits between the boys and Spears, who has had two stints in the hospital this year. Sadja began treating the singer during her most recent hospitalization at the UCLA Medical Center psych ward.

Angelina Jolie has penned an op-ed article urging the United States to help Iraqi refugees who have been displaced by the war. In The Washington Post piece titled, “Staying to Help in Iraq,” the actress and goodwill ambassador for the United Nations High Commissioner for Refugees says American support is key to addressing the humanitarian crisis, which has displaced more than 4 million people. Of the 2 million refugees within the country, 58 percent are under 12 years old, according to Jolie. The 32-year-old actress, who recently visited the war-torn country, writes, “What we cannot afford, in my view, is to squander the progress that has been made. In fact, we should step up our financial and material assistance.”

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Keeping in constant character for the role of Jackie Kennedy’s eccentric cousin Edie Beale in HBO’s upcoming Grey Gardens, Drew Barrymore refers to her real-life boyfriend Justin Long not by his name, but by the Edie-like label of “gentleman caller.”

Tracking the relationship between the actress-producer and the “Mac” in the Apple computer commercials, the March issue of Vogue, reports that the two knew each other for seven years before becoming serious.

Asked for his immediate reaction to what he thinks of when it comes to Barrymore, Long – who helped Drew celebrate her 33rd birthday this month – responds, “Beauty and light, and she shines it on everybody who comes into contact with her.”

As for her reaction to Long, a perennially smiling Barrymore says, “My cheeks hurt, I’m so happy.” Adds Long, 29: “She makes my cheeks hurt, too.”

Past Not Up to Speed
It wasn’t always so. While Barrymore considers herself secure in terms of dealing with her profession and her friendships, as far up-close-and-personal relationships are concerned, “for some reason, I have not grown up to the speed I am elsewhere,” she says.

Having twice walked down the aisle, Barrymore – who, exactly a year ago at this time, insisted she was happy to be single – and first husband, bar owner Jeremy Thomas, split after five weeks, while her marriage to gross-out comedian Tom Green lasted five months before he filed for divorce.

Those in Barrymore’s circle approve of the Vassar-educated Long, says Vogue. Nancy Juvonen, Barrymore’s production-company partner in Flower Films, says, “I do feel she is finally with a good person. She is with someone who adores her and doesn’t put her down on any level … And that is such a departure.”

Pamela Anderson is now seeking to annul her brief marriage to Rick Salomon rather than getting a standard divorce, according to court papers.

Anderson cited “fraud” as the reason for the annulment. No details were given in the court papers, which were filed last Friday in Los Angeles Superior Court.

After just two months of marriage, Anderson, 40, filed for divorce from Salomon, 39, in December, citing irreconcilable differences.

They were married last October in Las Vegas during a 90-minute break between the magic shows in which Anderson was appearing.

Less than two weeks after Benji Madden split from fiancée Sophie Monk, the rocker is stepping out with another blonde bombshell. The new woman in his life? None other than Paris Hilton.

“Yes, they are dating. It’s pretty serious,” a source confirms of the couple, who have been spotted together all over town – make that all over the country! In just the past few days, they have partied at Home nightclub in suburban St. Louis, shopped (while holding hands) at Hollywood’s Fred Segal, and even grabbed lunch with Madden’s mom.

On Sunday night, the two hit the Polo Lounge at the Beverly Hills Hotel, where they cuddled in a massive booth and engaged in an intimate conversation.

And the Madden brothers posted on their Web site a group picture that included Hilton. They called it a “nice little family photo” and described her as the “wonderful Paris.”

The apparent love connection is certainly convenient: His twin brother, Joel, dates Hilton’s B.F.F., Nicole Richie.

Out of the spotlight after revealing her pregnancy, 16-year-old Jamie Lynn Spears is moving ahead with her life, passing her GED and thinking about college, a family friend said.

The Zoey 101 star passed her high school equivalency exam about a month ago – scoring particularly well on reading comprehension – and is looking to take the ACT college entrance test, the friend says.

“She’s already got her diploma,” according to the friend. “She wants to take her ACT. She’s not wasting any time. People don’t know her. When she gets something in her head, she’ll make it happen. Everybody is so supportive of her.”

Last month, Britney’s younger sister was photographed in Hammond, La., carrying a GED book. She was accompanied by her mom Lynne outside a building that houses both the Tangipahoa Parish School System Adult Education Center, which is a GED preparation site, and the Title I Parent Center, which teaches parents how to help their children develop learning skills.