Hanson keyboardist/singer Taylor Hanson and his wife, Natalie, are expecting their fourth child this winter, according to People.com. "Each of our kids has made life richer and more exciting," Taylor, 25, and Natalie, 24, told the site. "We can't wait for this guy to join the party."

The couple met in 2000 in Atlanta while he was on tour with the band. After two years of dating -- and with a baby on the way -- they married in Georgia in 2002. The band's middle brother and his wife already have two sons, Ezra and River, and a daughter named Penelope.

But Taylor isn't the only Hanson brother busy doing diaper duty: Little brother Zac, 22, and wife Kate had their first child in May, while eldest brother Isaac, 27, and his wife, Nikki, welcomed their second son last month.

But being dads hasn't slowed down the pop trio, who are best known for their 1997 hit song "MMMBop" from the album Middle of Nowhere. Since starting their own record label, 3CG Records, in 2003, they have continued to put out new music on the indie circuit, releasing [article id="1565313"]The Walk[/article] last year. In September, they're hitting the road for the 35-stop Walk Around the World Tour -- and they're bringing the kids along for the ride. "We may have to think about getting a second bus," Zac recently told People.com in response to the brothers' expanding families.