Naomi Watts' trim post-pregnancy figure is all down to "solid underwear." The 39-year-old actress - who gave birth to her first son Alexander Pete with partner Liev Schreiber less than three months ago - admitted appearances can be deceiving and her toned physique was not all down to hard work in the gym.
When asked what her secret was, she joked to People magazine: "I've got a lot of solid undergarments!"
Naomi - who looked stunning in a figure-hugging black dress at a London Calvin Klein event on Monday - said the right outfit can give the illusion of a svelte figure.
She said: "Good classic lines can also help cheer up an out of shape body."
The 'King Kong' star hosted the launch of the fashion house's spring/summer 2008 collection in a basement of the University of Westminster where she mingled with guests including Bianca Jagger and Mary-Kate Olsen.
Naomi - who will attend the premiere of her new movie 'Eastern Promises' which opens The Times BFI 51st London Film Festival tonight - also gushed about the joys of motherhood, saying: "I love it! Love it!"
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