Mariah Carey’s boy toy Bryan Tanaka now has a special new toy of his own! “Mariah told pals that she bought Bryan a $10,000 life-size doll of herself so he won’t miss her when they’re apart,” a source tells In Touch . (See our sweet, sweet fantasy of how this fantastic plaything looks, at right.) According to the source, the Mimi doll comes with its own collection of sparkly designer gowns — duh! — so Bryan can play dress-up with Mariah when she’s away. “It also sings ‘Hero,’ ‘I’ll Be There,’ ‘Fantasy,’ ‘Dreamlover,’ ‘Breakdown’ and ‘Honey,’ which are Bryan’s favorite Mariah songs,” says the source. The diva’s doppelgänger talks, too — Mariah, 47, prerecorded a few special phrases for her beau, 33, including “Mimi misses you,” “You’re…