Bad boy former Mets star Lenny Dykstra is claimed to have trashed a fancy Hamptons hotel room and allegedly tried to swipe the towels, bedsheets and even the receptionist’s sunglasses.

The former World Series hero, 54, checked into the Hotel ZE in Southampton on Friday for two nights with a young brunette.

Guests complained on Saturday about noise and weed smoke. Dykstra, who served six months in prison in 2012 for bankruptcy fraud, strongly denies using drugs or stealing from the hotel, where rooms go for up to $1,500 a night and guests have included 50 Cent.

Owner Zach Erdem told Page Six, “You could smell the marijuana throughout the hotel . . . They were ordering a big bucket of ice and extra towels every few hours. At 3 a.m. Lenny called down, and my brother went to the room, knocked, and he was invited in by the girl who was fully naked.”

Erdem, who also owns Hamptons hot spots 75 Main, Kozu and AM, continued, “When Lenny left, there were open bottles of vodka and Jack Daniel’s, stuff everywhere. The cleaner saw [drug baggies], she said it was the worst room she has seen. He left a suitcase and a bag behind and a note to ship them to his home. But there were no sheets, pillowcases and towels left in the room.”

Erdem called Dykstra’s pals to open his suitcase, which contained 14 towels, pillowcases and bedsheets. In a laundry bag were 10 pairs of ladies’ shoes, a marijuana pipe and the hotel soap dish. “On the way out he also stole my receptionist’s sunglasses, we have it on video.”

Dykstra denied the claims. He slurred, “What? No! I didn’t steal anything. The stuff is still at the hotel. There was no maid service, towels and sheets were piling up, so I put it all in a laundry bag for them. I did them a favor and they call it stealing? This is ridiculous. Was I doing drugs? Absolutely not.”

Of the sunglasses, he continued, “Nobody took anybody’s glasses. They are saying the room got trashed like Keith Richards. It’s all lies.”

About that naked woman, he said, “I might have had 10 women in the room, might have had 15, might have had 20. Actually, the only thing I had in that room was my d - - k in my hand.”