If you're wondering what celebs were at Johnathon Arndt's house on Tuesday (Oct. 24), it might actually be easier to list the celebs who weren't there.

Arndt, the iconic jeweler designer, hosted a fundraiser for Sean Penn's J/P Haitian Relief Organization, and it sounds like he packed everyone who was anyone into his Brentwood home. Tim McGraw, Carrie Underwood and Mike Fisher, Kix Brooks, Kimberly Williams-Paisley, Jewel, Kevin Nealon, Susan Yeagley, Scott Hamilton and more all showed up to spread the word and shine a light on the needs of the struggling country.

"I called Tim McGraw after having not seen Tim for a couple of years. It was just that quick," Penn said of McGraw's involvement and his willingness to perform at the event, in the just-finished backyard ballroom. "These dollars go a long way. It's pretty magic. It might look slow, but poverty takes patience to fix," he added.

Worth an estimated $16 million, the 28,000-square-foot estate has three addresses along Concord Road, across from the Governor's Club.

Here are a few scenes from Tuesday's benefit: