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Did Ben Affleck's wifey toss out all of her old mom jeans?

On Monday afternoon Jennifer Garner was spotted leaving lunch at Tavern in Brentwood, and the 40-year-old mother of three showed off her slimmed down bod in a pair of pants we haven't seen her wearing since, well, ever!

Jen gave birth to the couple's third child just 8 months ago, and while she previously said that she wasn't in a hurry to lose the baby weight, she definitely looks slimmer now than she did 8 months after having her daughters Violet and Seraphina!

So what's her secret? Last month Jen told reporters at the New York premiere of her new comedy Butter that her trick to keeping her figure looking trim is to "double up on the Spanx." Hmm ... we're not buying it!