New mom Fergie showed off her fab body, six months after giving birth to son Axl.

Promoting a new ad campaign, the toned singer posted a sexy vid on Instagram, wearing just a pair of Calvin Klein underwear.


"Boom. #mycalvins," the 38-year-old rock star captioned.

"Extra's" Terri Seymour recently sat down with singer/songwriter Fergie to chat about 6-month-old son Axl Jack, her hubby Josh Duhamel, and when she's planning on getting back in the studio to record new music.

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