Singer Michelle Williams has joined the likes of David Letterman to open up about depression.

Williams — once part of Destiny’s Child alongside Beyonce and Kelly Rowland — said she recently emerged from years of the depths of sadness.

“I’ve dealt with depression,” the 32-year-old told the Associated Press during a break in rehearsals for a new production of Fela! “I had to choose to get out of bed and do whatever I needed to do to be happy.”

The depression started at age 15 or 16.

So far Williams has managed to stay away from medication, instead using exercise, therapy and positive thinking. But don’t be ashamed to get on drugs. “Go see a professional so that they can assess you. It’s OK if you’re going through something. Depression is not OK, but it is OK to go get help.”

Letterman recently admitted to Oprah he sees a therapist weekly for his depression.

Movie mania

Park City, Utah, is hot, even though there’s a chance of snow. Robert Redford opened his annual Sundance Film Festival on Thursday and said “diversity is the point,” further evidenced by contributions from 32 countries and 51 first-time filmmakers. The chorus of voices represented at Sundance “reflects the times we’re in,” he told reporters. Screenings, workshops, parties and schmoozing continue through Jan. 27.

Rockin’ clothes

Rihanna’s collection for British brand River Island is slated for its debut next month during London Fashion Week. The 24-year-old’s clothing and accessories will be shown Feb. 16. Items will be available in River Island stores in the United States starting March 5. Ri also signed on to executive produce and star in the Style network reality series Styled to Rock.

Teaming up

Good casting choice? Al Pacino will play Joe Paterno in a movie about the late Penn State football coach. Brian De Palma will direct the film, based on Joe Posnanski’s best-seller Paterno. Happy Valley reunites the Scarface and Carlito’s Way duo of De Palma and Pacino for the third time.

Blast from the past

An eclectic trove of memorabilia from the famed 1970s nightclub Studio 54 is hitting the auction block. The private collection of co-founder Steve Rubell is being sold at noon Saturday in West Palm Beach at Palm Beach Modern Auctions (17 Bunker Rd. 561-586-5500, info@modernauctions.com). Rubell died in 1989 and left behind photographs, letters and other memories to his onetime companion, who is parting with them now.