Britney Spears has got a brand new lob! Last night, the star got a little scissor-happy, and posted the gorgeous, collarbone-skimming results to Instagram shortly after. Spears has been sticking to her mile-long layers over the past few months, but a few weeks back, she trimmed her hair into a style that hit just below her shoulders. Her summer trim agenda seems to be on schedule, and although the change is subtle, she's definitely working it. Check out her new 'do below, and click through our gallery to see even more celebrity hair makeovers.