A birthday bash for a 5-year-old at a Queens catering hall turned into a bulletfest early yesterday when a gunman pumped a slew of slugs into two partygoers — and two Lamborghinis — cops said.

Sources said the East Manor mansion in Woodside had been rented by a rapper who goes by Ke$ha Lewis but is unrelated to the pop singer of the same first name.

The bash had attracted about 200 partygoers, including many from the music industry and presumably children.

The shooting erupted at 6:10 a.m. as the party was winding down and scores of revelers were milling outside the hall on Albion Avenue and Queens Boulevard, police said.

NY Post: G.N. Millerr

LAMBO . . . FIRST BLOOD: A shot-up Lamborghini sits yesterday outside the East Manor catering hall in Queens, where gunman had opened fire during a party.

Several men were heard arguing, and one of them whipped out a gun and opened fire.

Two men, Tony Malcolm and Daqua Pierce, were hit — one in the back, the other in the leg — sparking panic among the other celebrants, who ran for cover.

According to police, as the men lay bleeding, the gunman and his cohorts shot up a 2006 orange Lamborghini Gallardo convertible that was parked nearby.

No one was in the car.

The $125,000 Lamborghini, rented from a Massachusetts firm, took four bullets.

The slugs blew out the two passenger-side windows and punched holes in the windshield.

Cops later found that a second two-seat Lamborghini, parked a short distance away, had also been shot, sources said. No one had been in that vehicle, either.

The motive for the shooting remained unclear last night.

The victims were taken to Elmhurst Hospital, where they were listed in stable condition