Kings of Leon star Caleb Followill's bandmate brothers have taken to Twitter to congratulate the rocker on becoming a dad.

The "Sex on Fire" singer and his wife, Victoria's Secret model Lily Aldridge, became first-time parents on Friday when baby daughter Dixie Pearl was born.

And his siblings, Nathan and Jared, were among the first people to acknowledge the big news.

Drummer Nathan tweeted, "I can now proudly proclaim my love 4 my gorgeous niece Dixie Pearl Followill. The prettiest baby girl I've ever seen. I love her so much."

And brother Jared, who recently became engaged to another model, Martha Patterson, joked, "Thanks for all the congrats for the baby! I wasn't sure if it would be a boy or girl, but now I can proudly say, I'm an aunt!!!"

Aldridge, 26, and the 30-year-old Kings of Leon frontman wed at the San Ysidro Ranch in Montecito, California just over a year ago.