Taking to the social media platform, Chrissy exclaimed: "Somebody's herrrrrrre", adding baby bottle and smiling emojis to her post.
"I don't think Luna has a concept of exactly what it means to have a little sibling yet", Legend said. "It feels worse for me because with IVF you know *so* early", she shared.
She and Legend have been expecting their second child, as she announced her pregnancy in November. The parents have previously said that they are expecting a boy.
Mahira Khan stuns at her Cannes red carpet debut
The newlywed looked stunning in the attire, which was beautifully teamed with middle-parted hair styled into a no-fuss plait. Spike Lee's politically-charged drama received a 10-minute standing ovation from the audience at the Festival De Cannes .
Venting her frustration on Twitter, she shared: "Happy pregnant Chrissy is gone. meet OVER IT Chrissy".
Chrissy previously revealed she found her second pregnancy a lot harder than her first. "We've seen fertility doctors".
Last month (Apr18), Chrissy's close friend Kim Kardashian threw her a lavish baby shower in Los Angeles, with guests treated to Shake Shack burgers and milkshakes as well as five huge cakes.
Chrissy and John started dating in 2007 and married in 2013.