Stephanie Pratt: Would You ... You Know?

The annoying Stephanie Pratt donned a bikini as she taped a pre-Labor Day episode of The Hills with new cast member Kristin Cavallari in Malibu, Calif.

The 23-year-old sister of Spencer Pratt sure has whipped herself into shape, as the reality TV beauty didn't look nearly this svelte a few months ago:

Stephanie Pratt Bikini Pic

Stephanie Pratt filming The Hills. [Photo: PacificCoastNewsOnline.com]

With Indian summer in full swing, that means plenty more Stephanie Pratt on the beach in her two-piece, playing a big role in Season 5 of The Hills.

Which is great ... except it's Stephanie Pratt.

Sure, she's a cute girl. But she kind of looks like Spencer, which is kind of a turn-off, and she's also all sorts of painful.