And then she captioned the adorable photo with: "There's a baby bunny in my oven."
Rochelle married Marvin seven years ago. They already share two daughters together, Alaia-May, 7, and Valentina, 3.
The pair revealed last month that they are expecting their first son.
Marvin told OK! magazine he is thrilled to be having a boy.
He said: "I'm just so excited! I've always been outnumbered in the girl versus boy ratio.
"We've even got a girl dog, Ginger.
R O C H E L L E H U M E SIt was an odd Easter but we found some magic in the chaos. The Easter Bunny dropped by and sent Marv some back up ๐๐ถ๐ฝ #aneasterwewillneverforget
"But when we have our son then, yeah, Roch and I will be outnumbered."
They announced the gender reveal by sharing a video of their daughters enjoying an easter egg hunt.
Alaia-Mae read out a note that says: "Hippity hippity hop, I have great news that I have to drop.
"You and Valentina are such good sisters but now it's time to add someone new to the mixture.
"Now that's all from me, the Easter Bunny, the BIG news is you have a baby brother inside Mummy's Tummy!"
Rochelle asked Valentina: "What's in my belly?"
To which she sweetly replied: "A baby boy!"
What do you think of Rochelle's post? Share your thoughts with us on our Facebook page @EntertainmentDailyFix.