Model Danielle Knudson Celebrates 29th Birthday in a Bikini

Danielle Knudson doesn't need her man to ring in her 29th, she's doing juuuust fine all by herself ... as you can clearly see in these pics.

The Canadian model celebrated her born day Tuesday in Miami Beach -- where she was barely covered up by a bikini that showed off her amazing body. No sign of her latest BF -- Brazilian soccer star Alexandre Pato -- at the beach party. If he's smart, though, he wasn't far away.