Emmy Rossum made a quick coffee run on her way to the lighting of the 110-ft. Christmas tree at The Grove shopping mall in L.A. Where's some mistletoe when you need it?

Sean Kingston, Patrick Warburton and, of course, Santa Claus were also on hand to kick off the holiday season, L.A. style.

Also on the town -- Robert Downey Jr. shows off his wedding band outside Katsuya, Taye Diggs takes wife Idina out for a romantic dinner at Dan Tana's, and Lauren Conrad previews her "tacky" Christmas tree. (Spoiler: lots of tinsel and big colored lights involved!)

All this and more in today's "It's beginning to look a lot like Christmas" edition of Star Catcher Los Angeles.