Scott Disick is spoiling someone with lavish presents -- but it's not his girlfriend, Kourtney Kardashian.

On Sunday's all-new episode of Kourtney and Kim Take New York, Disick, 25, shows Kardashian his latest big buy: His very own $245,000 Rolls-Royce Ghost.

Fuming, Kardashian, 31, worries that Disick may have made a purchase he'll regret.

"I know you didn't buy the car, so who's is it?" she asks. (Watch a sneak peek clip above)

"I did buy it, actually," her man replies.

His girlfriend is clearly not impressed.

"This is ridiculous and embarrassing," says Kardashian, who tries to maintain a happy face while in full view of fans and photographers outside the hotel where she and sis Kim are staying for the show's filming. "What's the point of it? Especially in New York City -- we take taxis!" she snipes.

She's so miffed she calls off the couple's lunch date.

"I'm not going to lunch," she says. "I look ridiculous driving around in this car!"

Disick appears to be impressing his luxury lifestyle onto the couple's 13-month-old son, Mason.

"Mr mason in his first Lamborghini, couldn't find him a grey 1 like mine so I got him a white 1," the reality star Twittered, along with a photo of his son driving a toy version of the high-end wheels. Disick's matching Lamborghini Murcielago can cost $455,000.

Kourtney and Kim Take New York airs Sunday at 10 p.m. (EST) on E!

By Allison Corneau for For more Channel Surfing, click here.