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Sof\u00eda Vergara<\/strong><\/a> and Heidi Klum<\/strong><\/a> are all smiles for the cameras, but sources exclusively tell Life & Style<\/em> there\u2019s a big-time rivalry behind the scenes as they each try to outdo one another \u2014 with not-so-subtle nip and tucks!<\/p>\n \u201cThere\u2019s a lot of pressure on both of them to be perfect, and as genetically blessed as they are, everyone\u2019s convinced they\u2019ve been getting some help along the way from the plastic surgeon to stay so youthful,\u201d says a source.<\/p>\n The Modern Family<\/em> alum, 52, and the German supermodel, 51, appear to be very friendly as judges on America\u2019s Got Talent<\/em><\/a>, but off screen there\u2019s a competition of their own brewing.<\/p>\n \u201cThere\u2019s a very obvious game of one-upping being played between these two, but at least Sof\u00eda admits she gets some help,\u201d says the source. \u201cEveryone just rolls their eyes at Heidi\u2019s claims about being totally natural.\u201d<\/p>\n Sof\u00eda is \u201cactually quite open\u201d about her changing body \u2014 \u201cor at least to some extent, whereas Heidi\u2019s very guarded<\/a>,\u201d the source says. \u201cShe likes people to think she\u2019s totally natural and just happens to have her own fountain of youth.\u201d<\/p>\n One part of Sof\u00eda and Heidi\u2019s beloved bodies that they each say is totally real is their chests.<\/p>\n In fact, the source says they both \u201ctake a lot of pride\u201d in \u201ctheir boobs, and they both insist they\u2019re all natural \u2014 but a lot of people question that, especially with Heidi because she seems to have suddenly gotten bustier out of nowhere.\u201d<\/p>\n