The Giants celebrated their Super Bowl victory Sunday with Katy Perry. The team partied with the pop star until 3 a.m. in a second-floor function room at the team’s hotel, the Marriott, in downtown Indianapolis. Eli Manning’s family held a private party upstairs, and later joined the Giants bash. Spies said Perry was spotted going up to team co-owner Steve Tisch and congratulating him, and also chatting with tight ends Travis Beckum and Jake Ballard. Meanwhile, Tisch and his brother Jonathan partied with players including Mario Manningham, Justin Tuck, Brandon Jacobs and coach Tom Coughlin, as well as their families, by dancing the night away to a band. Victor Cruz was also at the bash, but he later snuck out of the hotel — and into a waiting van, past the crowds outside — to a party thrown by New York club Greenhouse. Spies said Cruz relaxed in a VIP area at the tented bash, with pals and girlfriend Elaina Watley, and he was presented with a 15-liter, $100,000 bottle of Armand de Brignac Ace of Spades Champagne. Cruz and friends, including rapper Lil Jon, then headed to nearby Sensu Lounge to catch a performance by rapper Fabolous. Over at the Patriots’ postgame party at the unfortunately named Victory Field, there was no sign of heartbroken Tom Brady and mouthy Gisele Bundchen. But some of the players did manage to lift themselves from the gloom to enjoy performances by Maroon 5, LMFAO and Earth, Wind & Fire. Matt Light and Rob Gronkowski were seen taking their shirts off and fist-pumping to hits including “Sexy and I Know It.”