‘Big Time Rush’ Star Kendall Schmidt — Check Out My Sissy Tattoo

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Big Time Rush” lead singer Kendall Schmidt has taken the phrase “man”s best friend” to a whole new level — by tattooing the face of his dog Sissy on his back … and our sources has the photographic proof.

Sources close to Sissy — Kendall”s adorable Boston Terrier — tell our sources … the singer immortalized the pooch”s mug onto the left side of his back a few weeks ago at Smith Street Tattoo in Brooklyn.

We”re told the ink job took about an hour and was pretty painful — but it won”t be his last … especially if he ever gets another dog.