Supportive and sweet! While he was finalizing his "Voice" team in the Blind Auditions episode of the hit music competition series, Blake Shelton took to Twitter to give a shout out to his former "Voice" co-star and current girlfriend, Gwen Stefani.

The former No Doubt front woman turned 47 on Monday, and her country crooner beau made sure he shared some public birthday love.

WATCH: Gwen Stefani Dodges Marriage Questions, Talks About Touring With Kids and Blake Shelton

"Happy Birthday @gwenstefani and congrats on the debut of @KuuKuuHaraiuku!!!!" Shelton tweeted.

Just ahead of her birthday, Stefani revealed that she was working on a new animated Nickelodeon show, "Kuu Kuu Haraiuku," which debuted on her birthday.

The show brings back Stefani's "Harajuku Girls," who were featured on her 2004 album "Love. Angel. Music. Baby.," and along with an animated version of herself, the five girls fight crime.

"Each girl in the show has their own personality and their own strength. I think that's what's fun about the show is that there's no boundaries and anything can happen," Stefani told Billboard.

The "Hollaback Girl" singer posted an Instagram of herself watching her new series, writing, "Had such s fun b day! Thanku for all the love and attention KUUKUUHARAJUKU Gx."

WATCH: Blake Shelton Plays the 'Gwen Stefani Card' to Steal a 'Voice' Contestant From Adam Levine

In addition to her exciting new project, Stefani might also have some fun plans on the horizon. The GRAMMY winner got suspiciously flustered when Ellen DeGeneres questioned her about a potential wedding to Shelton on her show in late September.

"You're crazy," she finally told the host, giggling.