'Troublemaker' singer Olly crossed paths with Cameron at the BBC Studios in London. While Olly was due to appear on BBC Radio Two, Cameron is currently in the city to promote her latest movie Annie.
Captioning the photo posted to Twitter, Olly joked: "Errrrrrrrrrrrr just found Mrs Murs @CameronDiaz."
Olly, who is dating girlfriend Francesca Thomas, was performing some songs live in the studio, but we wonder if Cameron stuck around to listen to him?
It's been a busy week for Olly, who graced the X Factor stage for the second time this series at the grand finale over the weekend. Olly was joined on stage at Wembley arena by Demi Lovato to sing their latest duet 'Up'.
It wasn't all singing though, as proving that he's well and truly in the Christmas spirit, former Xtra Factor host Olly gathered up Demi, Sam Smith and One Direction's Niall Horan to pose in a festive four-way jumper!
Olly will be hitting the road in March next year on his 'Never Been Better' UK and Ireland arena tour. Olly, who will be performing 16 dates, will be supported on tour by singer Ella Eyre.
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Watch Olly and Demi's video for 'Up' below: