Paris Hilton's pal Kobi posted this shot of the heiress slaving away in the studio last night, and it looks like everyone was having a blast working on her new album. Can't wait to hear it!

P tweeted, "Had fun at Sundance, just got back to LA ... Fun magical night in the studio, now time for bed. Sweet dreams everyone. xoxo Paris." Aw, but she didn't get any time to rest in between jetting back from Park City?! She really is the hardest working woman in showbiz!