Gwen & Gavin are Bathing Beauties

Add Gavin Rossdale to the list of stars who lead an ec0-friendly lifestyle. The rocker, 43, boasted that, in addition to recycling and installing solar panels on his home, he takes baths with his wife, Gwen Stefani, 39, to save water. Riiiight!

"All families should bathe together," Gavin told OK!. "It's the least they could do!" So are the couple's sons, Kingston, 2, and Zuma, 6 months, following in their parents' footsteps?

"Well, Zuma's 6 months old," he joked. "You know what babies are like!" But Gavin sees a musician in the making in Kingston who will join dad on tour in April. "He already has great rhythm," he says.

Meanwhile, Kingston's musical mom is getting ready to reunite with the band that made her famous — No Doubt!

The band, complete with lead singer Gwen, will reunite for the first time in five years on the May 11 episode of Gossip Girl where they will perform the 1981 Adam and the Ants classic "Stand and Deliver."

The Gossip Girl gig will also serve as the launch of No Doubt's reunion tour, their first in five years. Stefani, Tony Kanal, Adrian Young and Tom Dumont are currently working on the follow-up to their 2001 album Rock Steady.