The National Enquirer reports the pregnancy came as a surprise to the music legend, who already has seven children from previous relationships and marriages.

"Stevie never thought he'd be a father again so late in life. It may not have been planned but now he's excited," a source told the tabloid, according to Radar Online.

Wonder's fiancee Tomeeka Robyn Bracy has already had one child to the singer, according to reports.

"Stevie and Tomeeka had their first child together last year," a source told the National Enquirer. "I know because I attended the baby shower!"

Wonder has also reportedly moved in to his 25-year-old fiancee's LA pad, and is looking forward to taking a hands-on approach to fatherhood this time around.

"He's been going to all the doctor's visits and scans with Tomeeka," said the source, adding Wonder wants to make sure he dedicates plenty of time to his new children.

"He actually can't wait until the birth. Stevie missed so much of his other children's upbringings; he's vowed to be there for their children and for his soon-to-be new wife."

A pregnant Bracy, who is 39 years Wonder's junior, was seen taking a walk in LA with one of her daughters, sporting a large diamond engagement ring.

Bracy has had three children, but tragically lost her son Izaiah after he fell out of her third-floor apartment window and died at the age of two, the Dail Mail reports.

The National Enquirer reports that Bracy wants a boy with Wonder.

"Tomeeka has two other children, daughters Bri Sche' Milan and Kenaya Tare' Fair,"

"But Izaiah was her only son. Now she's hoping for one with Stevie."

Wonder's first child Aisha Morris was born to his secretary Yolanda Simmons in 1975, and is a singer who often tours with her father.

He has another daughter (not including his 'secret' daughter to Bracy) named Sophia Morris.

The singer has five sons, including two children from his second marriage to designer Kai Millard.

The pair married in 2001, and Wonder filed for divorced in 2012 after they had been separated for more than two years.

Wonder pays child support to Millard for their two sons, Kailand, 13, and nine-year-old Mandla.

His other son's names are Keita, Mumtaz, and Kwame.

Wonder, whose legal name is Stevland Hardaway Morris, was married to fellow Motown singer Syreeta Wright from 1970 until 1972, with their marriage ending on amicable terms.

The singer shows no sings of slowing down. Not only is he reportedly expecting the arrival of triplets while caring for a toddler, he's also about to start a tour in the United States.

The first of 11 shows in The Key of Life Tour is on November 6 at Madison Square Garden in New York.