Taylor Hanson announces he's expecting baby No. 7 with wife Natalie

The musician's six children are ages 17, 15, 14, 11, 7 and 1

Taylor Hanson's family is growing even bigger.

The "MMMBop" musician announced that he and his wife Natalie are expecting their seventh child together.

Hanson, 37, shared a photo of himself and Natalie holding hands while standing in a meadow. The two each wore large grins.

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"The best kind of unexpected," he said in the caption. "Number seven coming this December."

The couple married in 2002 and have since had six children: Jordan, 17, Penelope, 15, River, 14, Viggo, 11, Wilhelmina, 7, and Claude, 1.

Natalie shared a similar photo on her own Instagram account shortly after.

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"Biggest little surprise in a long time," read her caption. "Baby number seven coming this December."

"Our family is thrilled to be welcoming a new member later this year. More than ever, we are especially grateful for this fresh wave of joy," Hanson said in a statement to People magazine.

Hanson is one of seven children himself and is known best as a member of the band Hanson alongside his brothers Zac and Isaac.

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Isaac, 39, is a father of three -- Clarke Everett, 13, Nina Odette, 6, and James Monroe, 12 -- and Zac, 34, has four kids of his own: John Ira Shepherd, 12, Junia Rose Ruth, 9, George Abraham Walker, 6, and Mary Lucille Diana, 4.