Britney Spears explains F-word to sons Sean Preston and Jayden James thanks to Ke$ha

britney-spears-getty-30-yrs.jpgOops.

Britney Spears spent her 30th birthday (Dec. 2) relaxing in bed with sons Sean Preston and Jayden James, reading birthday greetings from fans. One of said fans was Ke$ha, who left Brit a rather blunt video message.

"Britney!" the pop-star-in-training proclaimed. "Happy f***ing birthday."

Brit wasn't quite prepared for the profanity, and she accidentally played the video while her sons were watching. Luckily, she wasn't bothered by the F-word. "Thanks Miss Kesha. Just watched this in bed w my boys. Now I have to explain what F***ing means!! U rock Xxoo," she tweeted.

Of course, Ke$ha wasn't the only fellow celeb who left Britney some birthday love on Twitter. We've already awwwed over *NSYNCer Lance Bass's birthday message to his old tour buddy. Britney spent the day thanking Miley Cyrus, Rihanna, Ryan Seacrest, Will.I.Am, Katy Perry, Justin Bieber, Kim Kardashian, Heidi Klum, Ellen DeGeneres, Nicole Richie, Paris Hilton, Victoria Justice, Demi Lovato, and more for their birthday messages.

(Yes, she replied to all of them! That's why we LOVE her.)

In a particularly heartwarming moment, Britney exchanged notes with her old "Mickey Mouse Club" pal, Christina Aguilera. "Happy 30th birthday @britneyspears!!!" Christina wrote.

"Thank you girl. Max is so cute! Miss you. Xxoo," Britney replied.

Awww.
Photo/Video credit: Getty Images