Janet Jackson
Jackson, 49, will be returning to the spotlight this year with the release of a new album and tour REUTERS/Tobias Schwarz

Seven years after releasing her 10th album, Janet Jackson is back in the studio and planning a musical comeback.

The singer, who hung up her microphone in 2008, will unveil her new record, Unbreakable, later in 2015 and is also planning a world tour.

Michael Jackson's sister sent fans into a frenzy when she teased a 43-second clip of a new song on Twitter along with the caption: "I wanna tell you how important you are to me! Love J. #ConversationsInACafe."

The 49-year-old singer later announced she will kick off a world tour this summer, which will see her perform 36 dates in 32 cities, beginning on 31 August in Vancouver, Canada, with her first US show slated for 11 September in Grand Rapids, Michigan.

Jackson's 2008 album Discipline debuted at number one on the Billboard 200 and spawned number of hit singles including Rock With U, Luv and Can't B Good.

The That's The Way Love Goes hitmaker, who has kept a low profile in recent years, married billionaire businessman Wissam Al Mana in a secret ceremony in 2012.

The couple only confirmed the nuptials months later to refute claims that that they were planning an extravagant wedding.

"The rumours regarding an extravagant wedding are simply not true. Last year we were married in a quiet, private, and beautiful ceremony," the couple said in a statement to Entertainment Tonight.

"Our wedding gifts to one another were contributions to our respective favourite children's charities. We would appreciate that our privacy is respected and that we are allowed this time for celebration and joy."