TV Watch Brody Jenner Smack a Man For Touching Kendall Jenner's Butt By Antoinette Bueno 11:18 AM PDT, July 31, 2014 ETONLINE Brody Jenner's got his sister's back.In this clip from Sunday's all-new Keeping Up With the Kardashians, Brody, 30, defends his half-sister Kendall Jenner, 18, when a man gropes her at a bar during the family's vacation in Thailand. Pics: Kendall Jenner's Best Modeling Pics After the man is seen touching Kendall, the model quickly moves away from him, with a shocked "Excuse me!" before quickly informing Brody of the situation.Not surprisingly, the former Hills star was having none of it."Did you just f**king touch my sister?" he confronts him.… And things quickly escalate from there when Brody smacks the sunglasses off his head.Watch the video to see the tense confrontation go down.Related: Brody Jenner Attends Reggie Bush's Wedding to Kim Kardashian Lookalike Lilit AvagyanKeeping Up With the Kardashians airs Sunday, August 3 on E!