Photo: Dave Benett/VF25/WireImage for Vanity Fair The rock isn’t in a hard place. Actually, it’s on the ring finger. Mick Jagger is engaged to 37-year-old Melanie Hamrick, with the retired ballerina revealing that the couple chose to keep their news private for a long time. “We’ve been engaged two or three years,” she said, according to People . “Maybe one day we’ll marry, maybe not. We are so happy in our current life that I would be too afraid to change anything.” Jagger and Hamrick have been