New York Jets quarterback Mark Sanchez may be limbering up for his big game on Christmas Eve against the Giants, but he's also been keeping time with curvaceous beauty Kate Upton, according to the New York Post.

Sanchez has been paying frequent late-night visits to the Victoria's Secret and Sports Illustrated swimsuit model's Manhattan apartment, the Post reported.

He has been spotted several times at the blonde's pad since November, usually after games or before practices, rolling up in his black chauffeur-driven Navigator.

Sanchez was even seen in Upton's building lobby carrying gifts for her after he attended a charity event early last month. On another occasion, Sanchez was spotted coming into the building with bags a minute or two after Upton arrived.

"They never come in together. He's always five steps after her," a source said, adding that Sanchez often hides under a woolly hat.

Upton has also attended some Jets games as her sister, Christie Upton, is a manager of client relations for the team and works closely with Sanchez.

Another source insisted that Upton and Sanchez are "just friends."

A rep for Upton, who was last year briefly linked to Kanye West, declined to comment on her personal life.

Sanchez's reps did not respond to the Post.

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