Nicole Richie left an LA gym yesterday, covering up with a red scarf and black beanie. She wasted no time getting back to her fitness regimen after a stay in St. Barts with Jessica Alba. Jessica and Nicole broke out their bikinis regularly while off celebrating the wedding anniversary of their friends Kelly Sawyer and Jamie Patricof. The fun wrapped up Monday, though, with Jessica, Nicole, and Jess's husband, Cash Warren, arriving back home. Now that Nicole is back in LA, she has more to do than hit the gym. She's back to promoting the second season of Fashion Star, though she still tweeted supporting words about her team on the reality design competition during her adventure in the Caribbean.