Minka Kelly by Steve Granitz/WireImage.com Minka Kelly by Steve Granitz/WireImage.com

Singer John Mayer has called a "time out" in his months-old romance with Friday Night Lights star Minka Kelly. "He just wasn't ready to commit to Minka or to anyone," a source tells Us. Kelly, on the flip side, was ready. "She was disappointed [by the split], to say the least," a source tells the glossy. "She was really happy but wanted a full commitment."