Just hours before news of the royal baby's birth made headlines around the world, the Need You Now singer welcomed little Eisele Kaye Tyrrell to the world in Nashville, Tennessee.
And several stars have taken to Twitter.com to congratulate Scott and her husband, Lady Antebellum drummer Chris Tyrrell.
Her bandmates Charles Kelley and Dave Haywood posted a message on the group's Twitter.com account, writing, "Congratulations to @HillaryScottLa and Chris, parents of the beautiful Eisele Kaye! Happy birthday and we love you!!"
And pal Underwood added, "@HillaryScottLa Congratulations, sweet Hillary! So many blessings to your family and its new gift from God! May she be just like you!"
Former Brooks & Dunn star Kix Brooks was also thrilled by the 'other baby news', tweeting, "Congrats to @HillaryScottLa of @ladyantebellum - sweet lil thing finally showed up! This is where the party starts!"
Scott took to her own Twitter page on Tuesday (23Jul13) to declare, "Thanks to Everyone for the congratulations, prayers, support, and love for our precious Eisele Kaye! She has completely stolen our hearts!"