Cavallari, Richie Both Hit Brody's Birthday Bash

Is Brody Jenner single? The Gossip may not know for sure, since his status appears to change every 12 hours, but we're doing some investigating. In the image below, taken Tuesday, Jenner and his newfound friend/companion, Nicole Richie, head to Hollywood club Privilege to celebrate Brody's 23rd birthday.

If you look closely, however, you'll see that the person holding Brody's hand is not Nicole, but perhaps the most important woman in his life â€" his mother, Linda.

Meanwhile, Jenner's ex-girlfriend Kristin Cavallari, who tells People that despite their recent breakup, the two are "still good friends" â€" arrived at club Privilege to join her onetime Prince Charming's birthday bash. For all we know, Kristin and Broday will be back together next week. Regardless, it's nice that the former Laguna Beach star is in good spirits.

It's rumored that Nick Lachey, who was romantically linked to Kristin after his infamous split from wife Jessica Simpson, was also in attendance.