Denise Richards & Richie Sambora Back Together for Friend"s B-Day Bash

They”re back on! Denise Richards and Richie Sambora celebrated a friend”s birthday at the newly opened Rosa Mexicano in West Hollywood. The on-again couple arrived on the later side – after dinner was served – but they were in festive spirits for the bash, which was held in the restaurant”s private dining room. Guests including Megan Fox and husband Brian Austin Green all shared a round of the restaurant”s famous frozen pomegranate margaritas. When it was time to go, Greene and Richards slipped out the back door to avoid the paparazzi. – Liza Hamm