Under pressure and under the knife?

After Janet Jackson revealed a trim figure onstage for her State of the World tour, sources say friends are suspicious of her extreme weight loss,

estimated at nearly 70 pounds, since giving birth to her son, Eissa, in January.

Everyone thinks she had a tummy tuck and lipo,” an insider says,

noting that such a rapid transformation seems “nearly impossible” for a 51-year-old woman to achieve naturally.

“Going through a high-profile divorce [from Eissa’s dad, Wissam al Mana], she probably wanted a quick ego-boost.”

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