07/29/2010 at 03:00 PM EDT
A dressed-up Lauren Conrad
arrived early to MyStudio in L.A. to support a friend who was deejaying at the popular nightspot. The reality star and her friends took over a table by the deejay booth and immediately began chatting and giggling with each other. They also cheered when their favorite song – "California Gurls"
by Katy Perry
– was played. Conrad, who rarely hits the clubs anymore, said hi to friends after taking a lap around the room, and also requested songs from her pal at the turntables.
Emmy nominee Jon Hamm
and his Mad Men
castmates January Jones, Christina Hendricks
and John Slattery
, celebrating their new season with a bash at Yxta Cocina Mexicana in downtown L.A. Hamm was looking dapper as ever, and was seated near Slattery at a private table, where they drank margaritas.
is still focused on his fitness! The actor, in all white, took an early evening jog alone down L.A.'s Runyon Canyon.
, picking up a late-afternoon lunch at Greenleaf Gourmet Chopshop in Beverly Hills. The actress, who was with two friends, grabbed a turkey sandwich – plus two salads – to-go, lingering on the restaurant's patio before hitting the road.
polished off an early dinner of salad on the patio of West Hollywood's Chateau Marmont. She also sipped a clear beverage from a wine glass, using a straw, as she chatted with her male dinner companion before taking off around 9 p.m.
By JENNIFER GARCIA and MARLA LEHNER