Demi Lovato splits from Valderrama

Demi Lovato has split from on/off boyfriend Wilmer Valderrama.

The 19-year-old singer - who rekindled her romance with the 31-year-old actor in October after splitting in June - tweeted a link to an article on Gossip.Cop.com which stated they had broken up.

Although Demi has since removed the tweet, she has posted a number of messages on the micro-blogging site which seem to allude to a split.

She wrote: 'Loyalty is EVERYTHING.. I'm thankful for my friends who stand by my side.

'The smartest thing a woman can ever learn, is to never need a man (sic)'

Demi also retweeted a famous Marilyn Monroe quote from another user, which read: 'A wise girl kisses but doesn't love, listens but doesn't believe, and leaves before she is left.' Marilyn Monroe (sic).'

The 'Skyscraper' singer - who was admitted to rehab in November 2010 for three months to receive treatment for 'emotional and physical issues' - recently insisted she has no time for romance.

She said: 'To be honest, right now there is no crush. I have a pact with my friends right now, literally no boys for X amount of days.'