Adam Lambert's biggest supporter? Pal Audrina Patridge.

"For those of you avid American Idol fans, I just wanted to remind you guys to tune in tonight to vote at 9 p.m. on FOX!" The Hills star blogs.

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"One of the contestants, Adam Lambert, is a close friend of mine and he's one of the most talented and sincere people I know -- he definitely has my vote :)" she continues.

Patridge, 23, posts a pic of her and Lambert, 26, mugging for the camera at his birthday party at West Hollywood's Chateau Marmont before signing off "xoxo, Audrina."

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