Tom Arnold: My Pal Bradley Cooper Is “Doing Great” Post-Split

 Jason Merritt/Getty Images; GABRIEL BOUYS/AFP/Getty Images

Don't feel bad for Bradley Cooper.

It's barely been a week since Us broke the news of his split with girlfriend of a year-and-half Renee Zellweger, but it appears the actor has already bounced back.

"He's doing great," Tom Arnold, 52, told UsMagazine.com of Cooper, 36, at a Tribeca Film Festival party in Hollywood Monday night. "He's doing amazing."

Arnold and Cooper became buddies while filming the martial arts spoof Brother's Justice a couple of years ago–long before the Limitless star's ascent to the A-list. "When we started, Bradley was the sixth guy on the call sheet," said Arnold. "When we finished he was the biggest star in the world. But he's got his feet on the ground. He's a very sweet guy." And to the delight of female fans worldwide–a single guy now too.

For her part, Zellweger, 41, isn't letting the break get her down either. She stopped by pal Sandra Bullock's NYC pad for a little girl talk last Saturday and later hit a pal's birthday bash at Esquina. "She wore a skin-tight black dress and amazing lace-up shoes," an eyewitness told UsMagazine.com. "She looked smokin' hot."

Sign up now for the Us Weekly newsletter to get breaking celebrity news, hot pics and more delivered straight to your inbox!

Want stories like these delivered straight to your phone? Download the Us Weekly iPhone app now!