On the same day Rochelle's maternity leave officially ended, the couple were seen leaving Novikov restaurant and arriving at DSTRKT night club with Marvin's JLS band mates Aston Merry and JB Gill.
Rochelle, who have birth to her first child on 20 May, looked gorgeous in her simple monochrome outfit, teamed with nude heels, an oversized clutch and big, bouncy, glossy hair.
It's one of the first times Rochelle has been seen in public since her daughter's birth last month, and doesn't she look amazing?!
Marvin, meanwhile, went for a very summery outfit, including a pink blazer and bright orange shoes, and had a very big grin on his face. That's probably no surprise, though, as just last week he revealed his favourite time of the week was "date night" with his beautiful wife.
The outfit that got the most attention, however, belonged to Aston, who rocked up to the exclusive club in his shorts. An amused Marvin tweeted a picture of them inside with the caption: "Shorts in the club yeh?! #AstonLikeBehaviour."
And for anyone wondering where fourth JLS star Oritse Williams was, apparently he was up in Manchester.
Marvin tweeted: "3 of ya boys holding it down in London tonight! @Oritse in Manc!! Big night..O where you at?!"
Perhaps the night out was to celebrate Rochelle's return to work. Earlier in the day she tweeted her excitement at getting back to work with The Saturdays, with her first task being a photoshoot.
She has been on maternity leave from the band since March.
Rochelle joked: "First day back at work! Off to a photoshoot. You can be glamorous sporting baby sick on your shirt right? Xx."
We can't imagine Rochelle looking anything other than glam!