Gwen Stefani Congratulates Christina Aguilera on Pregnancy with Awesome Throwback Pic!

Gwen Stefani steps out looking stylish and slim while heading to an acupuncture appointment on Wednesday afternoon (April 30) in Los Angeles.

The 44-year-old No Doubt rocker recently confirmed that she’s joining The Voice as a mentor for season 7.

“.@xtina congrats on yr baby *bunny 🐰Apollo & i cant wait to hang out w all the crazies #thevoice #surroundedbyboys,” Gwen wrote on her Twitter account, along with a throwback picture of the duo.

“.@gwenstefani #waybackwednesday old school pic! So excited for you… #TheVoice play dates!” Christina Aguilera responded.

FYI: Gwen is wearing DWP pants.

15+ pictures inside of Gwen Stefani treating herself to acupuncture…