Reese Witherspoon
never confirmed that she's pregnant, but she let the cat out of the bag at Cannes in a dress that showed off her growing baby bump.

Reese was all smiles at the premiere of her film, "Mud," yesterday flaunting her bigger belly in a gorgeous blue dress that really emphasized all of her her pregnancy curves.

The baby will be her first with husband Jim Toth.

The actress has two children with ex-husband Ryan Phillippe -- a daughter, Ava, and a son Deacon.

Check out more photos of Reese and "Mud" co-star Matthew McConaughey above!

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