Lead singer Caleb Followill popped the question to his girlfriend, Lily Aldridge, the band's rep confirms to PEOPLE.
And should he want to get a jump start on wedding planning, he needn't look any further than his brother (and bandmate) Nathan, who got hitched back in November.
Aldridge appeared in the band's video for "Use Somebody" and has been dating Followill for over two years.
The band, whose new album, Come Around Sundown will be released Oct. 19, is currently wrapping up their U.S. tour before heading overseas next month.
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