Whoa mama!

Two months after giving birth to son Phyllon (with hubby Sunnery James), supermodel Doutzen Kroes is back in runway shape.

Hitting the beach in Miami on Saturday, the Victoria's Secret siren, 26, showed off taut and toned abs in a sexy, leopard print two-piece. See more pics of the model's hot bod.

"I have to work really hard. My body--I have a voluptuous body. I am not one of these skinny girls," the 5-foot-9 Netherlands native has said. "I like to enjoy life. I am a totally healthy girl that eats but eats in moderation and I take care of myself."

Her focus now? Baby Phyllon, of course. "Becoming a mother is the best thing ever!" she tweeted after his January arrival. "All I can do is stare...."