The full-frontal nude photo circulating around the Internet today purporting to be Olivia Munn is a phony -- this according to sources extremely close to Olivia Munn. Several pics hit the web today -- appearing to show Olivia in various states of undress ... pink lingerie, a black bra, a white bra, a pink bikini, a low-cut v-neck ... and then fully nude. Sources tell TMZ, several of the shots are legit -- namely the black bra, the bikini, the v-neck ... all of which Olivia has previously posted...