Janet Jackson's husband threw her a surprise party for her 49th birthday

A source told Us Weekly magazine: "Thirty of her closest friends and family were there."

The businessman, 40, initially pretended he was taking Janet out for a romantic sushi dinner so she was amazed to be greeted by so many of her loved ones instead, including her brother Jermaine Jackson.

The insider added the group partied until 1.30am and enjoyed "two beautiful cakes."

Janet previously insisted she didn't mind that Wissam is almost a decade younger than her.

The singer - who once had a seven-year relationship with music producer Jermaine Dupri - said: "My mother always raised us to believe that age was just a number. All of us - my sisters, my brothers - we'll just tell you our ages because it's all about where you are mentally and how you feel about yourself. It doesn't matter."

The 'Love Will Never Do' hitmaker is currently gearing up to release her next album and is also said to be planning to launch a world tour later this year.

This will be the R&B singer's 11th studio LP and her first since 2008's 'Discipline', which was released on Island Records.