Brody Jenner Attends Wedding For Kim's Ex ... Feel the Burn!

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Brody Jenner may have been too busy to attend his step-sister's wedding last month, but he cleared the decks to attend her ex-boyfriend's nuptials.

Reggie Bush tied the knot in grand style -- though still short of Versailles -- at the Grand Del Mar in San Diego ... rated the #1 hotel in America by TripAdvisor.  

It's no secret ... there's no love lost between Kim Kardashian and Reggie, so it's pretty interesting Brody chose to go.  

Brody took a plus one ... GF Kaitlynn Carter.

So, we gotta ask ...