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WHITNEY HOUSTON: Whitney Houston's publicist says the U.S. pop star has voluntarily enrolled in an out-patient treatment program for drug and alcohol addiction.

The "I Will Always Love You" singer's representative told TMZ the decision to enroll in the program 10 days ago is part of Houston's "longstanding " recovery process.

The Grammy Award winner's substance-abuse issues and erratic behavior sidelined her once-bright career for more than a decade.

She re-emerged into the spotlight in 2009 with the album, "I Look to You." She has since worked to stay sober and has managed to avoid public scandal.

However, TMZ quoted a music industry source as saying the recording artist suffered a relapse two weeks ago.

"She was plastered and she was a mess," the unnamed insider said.

REESE WITHERSPOON: Reese Witherspoon's publicist says the U.S. actress is wearing a walking cast because she injured her left ankle but the injury is "nothing serious."

"She twisted her ankle and is in a walking cast temporarily. Nothing serious," Witherspoon's representative told People.com Monday.

No details on how she sustained the injury were provided.

The actress is best known for her Oscar-winning performance in "Walk the Line." Her other film credits include "Cruel Intentions," "Election," "Pleasantville," "Legally Blonde," "Rendition" and "How Do You Know."

ALICIA SILVERSTONE: Actress Alicia Silverstone announced on her blog Monday she has given birth to a son in Los Angeles.

The child is the first for Silverstone and musician Christopher Jarecki, who married in 2005, UsMagazine.com said.

"My husband and I welcomed our 7 lb 15 oz baby boy Bear Blu Jarecki into the world on May 5 at 7:50 a.m. We are all three in love," the "Clueless" and "Excess Baggage" star wrote online. "I'm so grateful to this community for all the love, support, good wishes and happy vibes you've sent me during my pregnancy ... it has been wonderful. Thank you all!"

BRISTOL PALIN: Bristol Palin has signed on to appear in a 10-part reality series on BIO, the U.S. cable network said Monday.

The 20-year-old daughter of former Republican vice presidential nominee Sarah Palin competed on "Dancing with the Stars." She also speaks publicly about her experiences as a young, unwed mother.

The Hollywood Reporter said the as-yet-unnamed BIO reality show will follow the younger Palin as she moves from Alaska, where her mother was once governor, to Los Angeles, where she will "work at a small charity in need." Also appearing on the show will be actor brothers Chris and Kyle Massey, the entertainment industry trade newspaper said.

"Bristol is the kind of personality BIO is drawn to," David McKillop, executive vice president of programming at A&E and the BIO channel, said in a statement. "Her personal life has been playing out in the media for several years, but this is the first time she's opening up her real life with her son and her friends the Massey brothers."