Since announcing that she and husband Marvin Humes were expecting their first child in the new year, Rochelle has been very discreet about showing off her growing baby bump.
On Tuesday night, however, the Saturdays singer squeezed into a tight leopard print catsuit that clearly showed her blooming state.
The 23-year-old and JLS singer Marvin attended 90s-themed fancy dress party for which Rochelle chose to dress up as Spice Girl Melanie Brown while Marvin dressed as MC Hammer.
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The newlyweds attended the fancy dress party with Rochelle's bandmate Frankie Sandford, who dressed up as Posh Spice, and boyfriend Wayne Bridge.
Clearly in the mood for party, the pair posed for a picture that they later shared with fans through Instagram: "MC Hammer and Scary Spice dating back in the 90's!!! Marv x."
Rochelle also wrote ahead of the outing: "Me, Marv and bump getting ready for @AaronRenfree 90's themed pop star party! Hurry up @FrankieTheSats and Wayne! Post pic later lol x x."
Last week Rochelle admitted that she was feeling "more pregnant" as people had begun noticing her blooming bump. On December 11 she tweeted: "Today I feel more pregnant than normal as a few random people have touched my stomach, not sure how I feel about the odd belly rub LOL."
The singers recently tied the knot at Blenheim Palace in Oxfordshire, with guests including X Factor judge Tulisa Contostavlos, One Direction's Harry Styles and HELLO! Magazine – the only publication invited to capture the day.
She and Marvin's baby news followed shortly after, and both expressed their joy online. "I wanted to be the first to tell you...we have some exciting news to share!" Rochelle wrote: "Marvin and I could not be more thrilled to announce that we are expecting our first child mid next year. We have always dreamt of being parents and the news is the best early Christmas present we could have asked for. I know Marvin is going to be a great dad and we're so excited to start a family."
The dad-to-be also had some excited words for his Twitter followers, saying: "Rochelle and I are SOOOOO excited to tell everyone that we are expecting our first baby!!! It's absolutely amazing! Baby is due middle of next year and all is great!! We want to say thank you to everyone for their love and support... it means so much to us!! We are over the moon! Love Marv x."
It's a little princess!