Jessica Simpson's Night Out With Fiancé Eric Johnson and Friends—See the Pic!

She spent 10 minutes at the Chateau Marmont with her group and then went to Wendy's

This mama knows how to have a good time!

Jessica Simpson was seen out with her fiancé Eric Johnson and some friends, enjoying the Los Angeles nightlife in the wee hours of the morning on Friday, Sept. 27.

The 33-year-old blond beauty was spotted at the Chateau Marmont at 2 a.m. with her entourage, but they left only after 10 minutes. The group then headed to Wendy's for a late-night treat.  

A stop at the fast-food restaurant just a day after she signed back as a spokesperson for Weight Watchers. 

Getting one last fix before the WW diet begins!

The fashion entrepreneur was photographed in her car, flashing a big smile. While we can't see her outfit, she looks gorgeous in the pic with her big hoop earrings and long wavy hair.

It was revealed on Thursday that Simpson is returning Weight Watchers after giving birth to her second child, Ace, back in June of this year. According to a reporter at Mediabistro who met with Andy Amill, the VP of Media Sales at the weight loss company, the fashion mogul is back on the roster.

The singer also said this week that she wants to get back to her roots, tweeting simply, "I need to make music."