Joel Ryan / Invision/AP 1 / 15
Joel Ryan / Invision/AP 1 / 15

Red hot mama!

Just five weeks after giving birth to her son Arthur Saint Bleick (father is fashion designer Jason Bleick), Selma Blair showed off her amazing figure at the premiere of her new film "Dark Horse" in Venice, Italy on Monday.

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The 39-year-old new mom wore a floor-length red Lanvin gown with billowy sleeves and pulled her hair back into a sophisticated updo, which accentuated her diamond earrings and smoky eye makeup.

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Earlier in the day, the actress attended a photocall for the flick dressed in a form-fitting green Roland Mouret dress.

Back in June, Blair gushed to Us Weekly about her pregnancy. "I feel like the luckiest girl in the world."

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The "Cruel Intentions" actress -- who ended her two-year marriage to Ahmet Zappa in 2006 and dated her "Kath & Kim" costar Mikey Day from 2008 until 2010 -- announced her pregnancy in January.