Kristin Cavallari

Kristin Cavallari Credit: Kristin Cavallari (Getty Images)

Whoa, mama!

Just seven weeks after giving birth to son Camden, Kristin Cavallari is showing off a seriously slimmed-down figure.

Wearing a body-hugging Rubin Singer frock and sky-high heels, the reality starlet made her first red-carpet appearance at ULTA Beauty's "Donate With a Kiss" event, supporting The Breast Cancer Research Foundation, at Jimmy at The James Hotel on Tuesday.

"She was truly glowing," said a witness of the 25-year-old new mom, who is engaged to Chicago Bears quarterback Jay Cutler.

Even though Cavallari looked great, she did indulge, "munching" on Georgetown cupcakes while showing off photos of her son, our spy said.

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