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10 May 2012, 16:48 | Updated: 10 May 2012, 17:21
The '30 Days' singer joined her fiance this week for a trip to the government headquarters.
The Saturdays' Rochelle Wiseman and JLS star Marvin Humes got the chance to visit 10 Downing Street this week to celebrate a charity event.
The 'All Fired Up' singer tweeted her excitement about the visit yesterday afternoon (9th May) and later treated fans to a picture of the engaged couple outside the famous front door dressed up in Dolce & Gabbana clothing.
"On my way to 10 Downing St with Marv, in support of @RaysOfSunshine very excited!" Rochelle tweeted on Wednesday. "Knock knock!! Who's there?!
"Home from what was a very long day! Had great fun at Number 10 :)," Rochelle later added, after uploaded a picture of the two.
Last week the rest of JLS took band mate Marvin over to Las Vegas and Miami as part of his stag do, and the four-piece band arrived back in the UK "safe and sound" on Tuesday.
Rochelle has been in the UK this past week alongside her bandmates in The Saturdays to promote their brand new single '30 Days'.
View a picture of The Saturdays' Rochelle Wiseman and JLS' Marvin Humes outside 10 Downing Street below (Credit: Twitter):