Today is a big day in Taylor Swift's life -- she turns 21!! And while fans around the world are helping celebrate the special day, Taylor's celebrity pals are sending their wishes to the singer.

Friends of the country star took to their Twitter accounts today to spread love to the new 21-year-old.

Stars Tweet Their Birthday Wishes To Taylor Swift!

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Hayley Williams of Paramore tweeted, "Hey!! Today is my girlfrannn @taylorswift13's 21st birthday!!! Holy heck. She's all growed up. So blessed to know her. Tweet her some love!"

Selena Gomez, also known as one of Taylor's bff's, tweeted her birthday wishes to her friend by saying, "Happy Birthday @taylorswift13!!! I love you so much!!"

Katy Perry tweeted, "@taylorswift13 happy 21st gorgeous!"

Celeb blogger Perez Hilton tweeted his love for Swift by saying, ""@taylorswift13 ¡Feliz cumpleaños! #HappyBirthdayTaylor."

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Taylor got her birthday started early by tweeting on Sunday, " "Snowflakes are flurrying down outside and it's my last day of being 20!" she wrote. "Tonight @caitlinbird and @elizabethhuett knocked on my door — they brought a pizza with a lit 21 candle on it and bday hats. Now I'm dancing around my room alone to @pink's greatest hits cd."

Happy Birthday Taylor from all of us at Hollywire!