The Insider.com

Leonardo DiCaprio, Reese Witherspoon, Kate Hudson Cameron Diaz, Uma Thurman, Amy Poehler, and Armie Hammer
The art and film worlds collided on Saturday night at a black tie tribute for Clint Eastwood at the LA County Museum of Art. Armie Hammer (whose family owns an art museum across town) joked about his "rivalry" with this museum and told me he personally collects art from the LA painter who set up him and wife Elizabeth on their first date, Tyler Ramsey. Inside, Jon Hamm, Amy Adams, Zac Efron and couple John Krasinski and Emily Blunt had heads spinning in the star packed room.

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Joe and Nick Jonas
No dates for either of the two Jonas Brothers, as they arrived at the same LACMA event as a duo.

Rachel Bilson
Meanwhile over the hill in the Valley, Rachel Bilson caught an early Saturday dinner with her two younger sisters at Art's Deli in Studio City.

Pete Wentz
Pete Wentz brought along his own cheering section - newish girlfriend Meagan Camper - as he performed with new band The Black Cards at the Details @ Midnight party in the space formerly known as Hollywood secret Paul and Andre on Friday night. Curiously, Wentz was the only one in a tie at the late-starting, dark, loud, and rocking bash.

Jennifer Love Hewitt
Later in Hollywood, JLH made a late night cameo - in-and-out in 10 minutes - at the supperclub turned nightclub Lexington Social House, right by Hollywood and Vine.

L.A. Reid
As ads for The X Factor played on the TV's in front of his face during Sunday afternoon football, L.A. Reid (in a black top, black spandex, and no glasses) kept running away on a treadmill at Equinox West Hollywood.

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