@Rihanna:

HAPPY BIRTHDAY @britneyspears love ya

@JustinBieber:

happy birthday shoutout to my friend @britneyspears

Kim Kardashian:
Happy birthday to the beautiful Miss Britney Spears! Welcome to the 30’s club, Brit!! I wish you all the best for this next year and beyond. You’re going to love your 30’s! I love you and hope you have a magical day. Xo

@TheRealXtina
Happy 30th birthday @britneyspears!!!

UPDATE: Lance Bass made a little video, and Tweeted:

Happy 30th grandma!!!

@ChaseBenz
Happy Birthday, Boss!



UPDATE: Lots more:
Adrien Galo
On The to Mexico City 😉 happy birthday to my boss @britneyspears 😉

Candies
Happy Birthday Britney Spears! We ♥ our former Candie’s Girl! XO twitpic.com/7n36q5

SonyMusicGlobal
It’s Britney’s birthday, b*tch! Happy Birthday Britney Spears! We love you, @britneyspears! Happy 30th…many more!

E!
Anatomy of a Pop Superstar: Happy 30th Birthday, Britney Spears! eonli.ne/t0UC7Y

Rhianna
HAPPY BIRTHDAY @britneyspears love ya

Perez Hilton
Happy birthday, @britneyspears!!!! perez.ly/uS4zBG I’m still a slave for you!!! xoxo

brain friedman
Happy Happy Bday Brit xxxo @britneyspears B

dj pauly d
Happy Birthday To My Girl @britneyspears !!!i luv Birthdays !!!

jamielynnspears Jamie Lynn Spears
Happy Birthday @britneyspears !!! Me and maddie love and miss ya very much!!

TMZ
Britney Spears Is 30! Now That’s Crazy! bit.ly/rLYuJb

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