A 2009 AP file photo shows Nathan Followill of the rock band Kings of Leon.
His bandmates - brothers Caleb and Jared Followill and cousin Matthew Followill - attended the wedding in Tennessee on Saturday. So did actress Scarlett Johansson, a high school friend of the bride.
The 25-year-old bride spread the news on Twitter: "Allow myself to introduce myself: Mrs Jessie B. Followill."
The band's hit singles include Sex on Fire and Use Somebody. This month, they released their first DVD, Live At The 02: London, England.
Baylin's second album, Firesight, was released in 2008.
