Katrina Darrell sucks.

No, we aren't referring to this American Idol contestant's lack of singing talent.

We're talking about the crooner's ability to take a swig of a drink, via a straw in a glass being held by her friend's cleavage. Naturally.

It turns out Darrell's bikini-baring audition for Idol last week wasn't the first time she made news for breast-laden photos.

She and her gal pals partied at Hollywood club Kress a few weeks ago. The evening started out innocently enough...

From there, however, it took a turn for the erotically thirsty...

Katrina Darrell, far left in both photos, uses breasts for attention. And as a coaster.