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Kim Kardashian and Kanye West were camera ready at Denise Rich’s annual Angel Ball at Cipriani Wall Street in New York City on Monday night.

Kardashian fixed and adjusted the Grammy-award winner’s tuxedo all night. “They were super cute. She was primping him a little bit,” an onlooker tells PEOPLE.

“Kanye later surprised Kim with a chocolate ganache birthday cake, which had ‘Happy Birthday Kim’ written on it in white chocolate,” the source adds. “They kissed and he helped her blow out the two candles.”

The couple appeared to be very much in love, but Kardashian’s friend Jonathan Cheban squashed any rumors of a marriage proposal.

When asked if they were planning to get married, Cheban told PEOPLE, “I don’t think so – but I hope so because I really love Kanye, and he’s just awesome to hang out with.”

“They’re a perfect couple to me,” he said. “They’re just so cool. He knows everything about fashion and style and she loves getting dressed up. He’s so smart and they kind of work at their business together so it’s a really good combination. The love, the business, the fashion, the style … everything works.”

The annual Angel Ball raised $3.7 million for cancer research.
– Carlos Greer