Congratulations may be in order for Janet Jackson who reportedly has let billionaire boyfriend Wissam Al-Mana put a 15-karat ring on it!!!

According to reports:

The singer’s boyfriend, bil­lionaire Qatari businessman Wissam Al Mana, recently popped the question, and now the happy couple is planning an end-of-the-year marriage ceremony.

“Janet is head over heels in love with Wissam,” said a close source.

“He’s showered her with love, expensive presents and boosted her self-esteem by helping her lose weight and shape up.”

Wissam, 36, first brought up a walk down the aisle last fall, when he reportedly presented the Jackson clan beauty with a magnificent 15-carat diamond ring.

But Janet, 45, wasn’t ready because she wanted to focus on preparations for her current concert tour, which runs into September.

“Now Janet’s telling friends that an official engage­ment announcement will come by summer’s end, and that she and Wissam will marry in late 2011 – and they’re shopping for an even bigger diamond ring to celebrate their official engagement.”

The two are anxious to start a family as soon as possible. Janet would love to have a baby the natural way, but at 45, she’s also looking into adoption possibilities, according to the source.

She met Wissam at a Mid­dle East event in December 2009, and he recently took her to visit his family in Doha, Qatar, according to the source.

“Janet says she’s finally found her knight in shining armor!”