Actress Nicole Sullivan fears she's become a target for teen fans of heartthrob Zac Efron after groping his backside in a comedy sketch.
The 17 Again co-stars appeared together in a skit for Will Ferrell's FunnyorDie website, in which she played the flirtatious girlfriend of his fictional Uncle Hank.
Sullivan got to fondle Efron's derriere in the video - and was blown away by his firm behind.
The actress tells NYPost.com's PopWrap, "I can describe it exactly: two large, firm grapefruits. It is the tightest little butt I have ever seen in my life. I was shocked because he's a slight guy - but he is in shape! It was a nice deal; two solid grapefruits. All other booties pale in comparison!"
But now she's scared his screaming hordes of fans will try to hunt her down: "I told him, 'Zac, do you know how many girls would cut off my hands and put them in formaldehyde if they knew how often they touched your butt?'"