Reclusive Ryan Gosling – the Barbie flick's hunky Ken – has quietly struck up a surprise friendship with funnyman Conan O'Brien , RadarOnline.com can reveal.

The 44-year-old Notebook heartthrob has a reputation as one of Tinseltown's most solitary celebrities – he rarely hangs with his acting peers, preferring to hole up with longtime galpal-actress Eva Mendes , 51, and their daughters Esmeralda, 11, and Amada, 9.

But that's changing thanks to his burgeoning bromance with the quirky 62-year-old late-night host, who's got Mendes' stamp of approval. Article continues below advertisement

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Revealed a pal: "The whole Mende

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