Stars are consistently swarmed by fans at Utah's Sundance Film Festival, but there's one place they can find anonymity: on the slopes.

Wearing a helmet and goggles, "Entourage" star Adrian Grenier was just another snowboarder out having fun.

The actor/producer came to the festival to support his latest non-"Entourage" project, a documentary called "The Lonely Whale." He plans to launch a Kickstarter campaign to finance the film, which follows a solitary whale off the coast of California.

But the 38-year-old made sure to set aside a day for snowboarding. "I have no business doing this," he said before catching air.

"Everyone's so caught up in the movies and the dinners and the parties and the gifting suites that I think the nature that surrounds the event — the snowboarding, the skiing — is kind of an afterthought," said Shaun Neff, founder of Neff activewear.

Hoops headliners

Ariana Grande isn't the only big-voiced singer performing at the NBA All-Star Game: Christina Aguilera has been added to the lineup. The NBA announced Tuesday that Aguilera will perform ahead of the 64th annual game Feb. 15 at Madison Square Garden in New York City. She will sing a "New York-themed medley" during player introductions and be joined by the Rockettes dance troupe. Aguilera returns next month as a mentor on NBC's "The Voice" after a two-season break. The All-Star Game will air live on TNT. Grande will perform during the halftime show.

grandstanding: The Minnesota State Fair has announced three more grandstand shows for this year: Def Leppard with Styx and Tesla on Aug. 27; Alan Jackson with Brandy Clark on Aug. 30, and the Happy Together Tour on Aug. 31 with the Turtles, the Association, Mark Lindsay and other golden oldies. Tickets to the concerts — whose headliners have been regular fair visitors — will go on sale Feb. 3 at and 1-800-514-3849. Other new concerts include Gregg Allman on March 27 at the Pantages Theatre (on sale Friday); Death Cab for Cutie on May 2 at Northrop Auditorium (on sale Friday), Sufjan Stevens on April 22 at Northrop (on sale Friday) and Mark Knopfler on Sept. 29 at the Orpheum Theatre (no ticket details announced).

Mentor: Mark Ronson is lending his "Uptown Funk" to budding musicians. He will serve as ambassador for the 2015 Grammy Amplifier, a program for mentoring 25 artists. The top three will win a recording session with a Grammy-winning producer, film a video and perform at a music festival.

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