Rita Ora has ''moved on'' from Calvin Harris.

The 23-year-old singer and the 30-year-old DJ recent;y ended their year-long romance but the 'I Will Never Let You Down' hitmaker insists she doesn't regret any of their time together.

She tweeted: ''I don't usually address speculation but I've had an incredible time with Calvin, and I will treasure the memories.

''I've moved on so I hope people will respect that and do the same.''

Calvin used Twitter last week to announce the couple had split.

He wrote: ''To address speculation -- myself and Rita ended our relationship some time ago. She is a beautiful, talented woman & I wish her all the best. (sic)''

Since then, it has been speculated he instigated the split and his former girlfriend was left embarrassed when he published the message as she thought they might be able to resolve their differences.

A source said: ''Rita was left embarrassed when he tweeted that it was all over.

''She didn't think he was going to make the announcement, so she was shocked.''

The couple first split in January for a couple of weeks after a huge row but despite getting back together their hectic schedules meant they rarely saw each other.

Rita had also been seen partying and cosying up to other men in Instagram photographs and spent time been in Mexico with friends including the R&B singer Khalil Amir Sharieff, who was arrested in Miami with Justin Bieber earlier this year for drag racing.

The source said: ''It was Calvin's decision to end the relationship. They had been arguing for months and had grown apart.

''She was constantly posting snaps of her with other groups of friends and her trip to Mexico and photos of her with Khalil were the final straw.

''Calvin likes more privacy than Rita and he hated the extra attention that came with being her boyfriend.''