Two clubbers looking to impress a rap star in a celebrity-studded Chelsea hot spot wound up behind bars after they rang up a whopping $28,500 tab on expensive champagne — and tried to pay most of it with a bogus debit card, officials said.

Robsson Depeine, 23, Jeff Sylvain, 24, and five friends had reserved a table Monday at M2 Ultra Lounge on West 28th Street, according to general manager Dan Devlin.

Rapper Juelz Santana was throwing a party with such guests as hip-hop superstars Lil’ Kim and Snoop Dogg, Devlin said.

Depeine and Sylvain ordered 10 bottles of Moet Nectar Rose at $400 a pop, Devlin said — sending some to Santana’s table.

They were busted, he said, when they tried to settle their tab — which reached $24,500 — with a doctored AmEx gift card.

Their lawyer said they never put down a gift card but that the club couldn’t find the real culprits.