On Monday (December 2), Britney Spears' boyfriend Sam Asghari celebrated her 38th birthday with a sweet instagram message.

"We live, we laugh, we argue, and most of all we LOVE ❤️ There’s a reason why the world fell in love with you! You might be the princess of pop but mostly you’re my princess 👸" he wrote. "Biggest Happy Birthday to you @britneyspears 🎆 My Ass still hurts from falling and breaking the ice 😂😂😂😂 you get it? 😉 #breaktheice"

The pop icon has had a hard year as she continues to struggle with her mental health; however, a source close to her told Entertainment Tonight that she's doing "incredibly well."

"Britney struggles to keep her life on track, but right now she’s been doing incredibly well. Her family is very proud of the steps she’s taken to get where she is today," the insider said. "Britney’s been following her doctor's orders and is in a very stable place at the moment. She is trying to keep life simple and spend time with [boyfriend] Sam [Asghari] and her kids [14-year-old Sean and 13-year-old Jayden] whenever possible. She plans to spend her birthday with her boys. She wants to just have a nice time with family."

Happy birthday, Britney!

Celebrity Fans of Britney Spears