Biggest surprise ever': Pixie Lott reveals she's engaged to long-term love Oliver Cheshire as she shows off dazzling diamond ring on Instagram

They've been enjoying a blissfully happy romanceover the past six years.And on Sunday Oliver Cheshire, 28, finally poppedthe question, proposing to his girlfriend Pixie Lott,25, in the heart of London.The male model and actress/singer both took to their Instagram accounts to share the happy news on Sunday evening after Oliver got down onbended knee in the shadow of St Paul's Cathedral.

Pixie exclaimed it was the 'biggest surprise ever' as she showed off a dazzling diamond ring, adding simply in the photo's caption: 'so happy.

The gorgeous blonde also shared a snap of the two kissing in front of St Paul's as the sun set, with glasses of bubbly in hand, alongside the caption 'ahhhh'.Oliver meanwhile joked that he'd been 'caught in the act' after a fan spotted the romantic moment, with Pixie seen wiping away tears of joy.
Reposting photos of the big moment, Oliver - whobegan dating Pixie in 2010 - told his fans: 'Caughtin the act. She only bloody said yes.'A representative for Pixie told MailOnline on Sunday:  'She's so excited and celebrating with her family - and it was the most wonderful surprise at St Paul's Cathedral this afternoon.'The lovebirds' engagement comes several months after Pixie complained that she regularly faced questions about when she and Oliver would take their romance to the next level.