“It was like oh my god, I have known you for this long and I’m falling in love with every little thing that you do,” Colbie gushed of her new boyfriend!

Grammy winner Colbie Caillat has a boyfriend — but it’s not who you would guess! Sorry, Jason Mraz, but Colbie has “fallen for” her best friend and guitarist, Justin Kawika Young. “I didn’t know what it was like to be in love with your best friend,” Colbie dished to HollywoodLife.com exclusively May 23 at VH1’s Save The Music Summer Kick-Off at the W in Hoboken, N.J. “But now I know. So when I sing [“Falling For You”], I’m like oh my god, I’m relating to my own song finally!” Read more of our EXCLUSIVE interview with Colbie!