It's been just seven months since Danica McKellar gave birth to her first child, gorgeous son Draco, but already she's back to her slender best.
And the former actress revealed her secret at the LA Book Festival, though it's a cure that some will find less appealing than childbirth itself.
Danica, 35 , says her physique is all down to her preoccupation with mathematics, yes that's right, doing sums keeps her slim.
Slender: Danica McKellar shows off her enviable figure at the LA Book Festival yesterday, just seven months after she gave birth to her first child
What a turnaround: McKellar with her bump last August and at the fair yesterday
It certainly all adds up when you take in the ratio of her hips to waist to chest, but how can adding sums to your life subtract inches from your body?
'I don't really have time to eat as I'm too busy working on my math or with Draco,' she told fanzine Number Zen at the star-studded event yesterday.
'It's such a diversion to be constantly thinking of better ways I can teach people math that my hunger is for that really, for new ways of translating the beauty of it.'
Three is the magic number: Danica's perfect equation, her, Draco and his father
TV classic: McKellar as Winnie Cooper and Fred Savage as Kevin Arnold in The Wonder Years
We're not buying that most people would happily swap a Flake for a fraction, or embrace a binary subtraction as readily as a bacon sandwich.
But then Danica, who played Winnie Cooper in the hit American comedy drama, is an education advocate for mathematics.
She's also the author of three best-selling books for junior high schoolgirls, entitled Math Doesn't Suck, Kiss My Math and HOT X: Algebra Exposed, so it's far to say she has a passion for the subject.
The brunette beauty gave a speech at the event but was mortified when her papers blew away in the Santa Ana winds: 'It added a bit of drama,' she said.
Avid reader: Jada Pinkett-Smith chairs session with Sister Souljah at LA Book Festival yesterday
Peddling her wares: Hilary Duff spent all day signing autographed copies of her new novel, and smiling tirelessly
Her other love is her family, and she was 'overjoyed' after giving birth to her first child with composer husband Mike Verta last September, they named him Draco after the Latin word for dragon.
Danica wasn't the only celebrity to grace the literary event, of course.
Actress Jada Pinkett-Smith, 39 , chaired a session with her favourite author, Sister Souljah, who is known as the definitive writer of the hip-hop generation.
Hilary Duff, meanwhile, was promoting her first novel, Elixir, and sat merrily in a booth all day signing copies and never failing to produce a smile.
