The next time Kim Kardashian spends some family time with Brody Jenner ... it might be a little awkward. Over the weekend, Brody and his girlfriend Kaitlynn Carter attended the wedding of NFL player Reggie Bush -- Kim's ex -- to dancer Lilit Avagyan in San Diego. Maybe he was in a matrimonial mood after missing his stepsister and Kanye's nuptials?

The former "Hills" star posted numerous shots from the affair on Instagram, including a picture with the couple and some cute shots taken from a photobooth.

As fans of "Keeping of With the Kardashians" will recall, Kim had a very public, on-and-off three-year relationship with Reggie that eventually ended in March 2010.

Brody was noticeably absent from Kimye's lavish wedding in May, reportedly due to the fact that his girlfriend did not get an invitation. However, during a recent podcast, Brody revealed that he didn't make the trip overseas because he had a prior work commitment as a DJ at Home Bar in Chicago.

"Realistically, I had work commitments and it was a long way away. We talked about it. It was very simple. After I got the invite, I said, 'Unfortunately, I won't be able to attend but I wish you the best. I love you,' " Jenner explained. "And she was fine with it. So if she's fine with it, why is everybody else not okay with it?"