Janet Jackson has announced a comeback album and world tour.

The superstar - who turned 49 today (16.05.15) - surprised fans by posting a video on her Twitter last night (15.05.15), announcing her 11th album, which will be a follow-up to 2008's 'Discipline'.

Janet said: ''I promised you'd hear it from my lips and now you will. This year: new music; new world tour; a new movement. I've been listening. Let's keep the conversation going.''

The video was captioned, ''My Conversation'', and included the hashtag, ''Conversations In A Cafe'', which may be a reference to the name of the 'That's The Way Love Goes' singer's new album.

It was rumoured earlier this year that the sister of Michael Jackson - who recently moved record labels to Atlantic Records - would be releasing new music on 10 July, after the forum Janet.Club.com posted a photo of an album box with ''reserve your copy today'' written on it, in what looks like a record store.

The Twitter post accompanying the photo read: '' @harmonicait ...Call the FYE in BKLYN and ask if Janet is in their release sched. They say yes. From the store... (sic)''

Janet still hasn't confirmed a release date for her new music.