Rumer Willis & Lily Collins: Secret Gotye Concert!

Rumer Willis and musician Gotye pose together on Monday (April 23) in Hollywood.

The 23-year-old actress attended Gotye‘s secret performance, along with celebs including Kris Allen, Lily Collins, and The Hills alumni Lauren Conrad and Audrina Patridge.

PHOTOS: Check out the latest pics of Rumer Willis

Rumer first stopped by the VIP area before making her way toward the stage. She also got to greet Gotye after his set!

“Lily looked like she really enjoyed Gotye‘s performance,” an onlooker tells JustJared.com. “She also laughed a lot when Gotye talked between songs.”

10+ inside of Rumer with Gotye and also Rumer the next day at a local gas station…