Gwen Stefani Calls Blake Shelton Her 'Favorite Person' She Ever Met on His Birthday

Gwen Stefani checks out some party supplies while making a stop at Aahs on Thursday afternoon (June 16) in West Hollywood, Calif.

The 46-year-old singer might have been picking up supplies for a party for her boyfriend Blake Shelton, who turned 40 on Saturday (June 18).

PHOTOS: Check out the latest pics of Gwen Stefani

On Blake‘s birthday, Gwen took to her Twitter account to share a sweet birthday message.

“Happy birthday to my favorite person I ever met @blakeshelton gx 🐄🐝🌻#superbabe,” Gwen tweeted along with a childhood photo of his. He responded saying, “Now THIS is how you start your 40′s!!!!!!!! Thank you @gwenstefani for everything…”