A Brooklyn child molester who was given a two-year prison sentence by a judge in a shocking sweetheart deal was smacked yesterday with federal charges that could lock him up for life.

Unrepentant perv Andrew Goodman (pictured) — who creepily told his trembling teenage victim, “I love you” at his July 12 sentencing before state Supreme Court Justice Martin Murphy — was charged by the feds with having sex with the same boy in a New Jersey hotel room in 2010, then taking him to a Kid Rock concert in Atlantic City.

If convicted of transporting a minor over state lines to engage in sexual activity, Goodman would serve a mandatory minimum of 10 years. He could face up to a life sentence.

“It is an incredibly serious charge,” said Assistant US Attorney Tyler Smith.

“The case against the defendant is also incredibly strong.”

Murphy’s lenient punishment — and Goodman’s outrageous courtroom antics in front of his victim — drew fierce criticism when the 27-year-old was sentenced for molesting the now-17-year-old boy and his brother over several years.

“He’s shown himself to be essentially remorseless,” Smith said, noting how Goodman professed his undying love for his victim at his sentencing, a gesture that drew gasps of disgust.

Goodman was arrested in 2010 and could have completed his sentence by September.

“I don’t think he saw this coming,’’ said his court-appointed lawyer Michael Padden.

Brooklyn DA Charles Hynes, who strongly opposed Murphy’s sentence, applauded the move to nail Goodman on federal charges.