She’s a total Betty.

Taylor Swift toasted Patrick Mahomes at his 30th birthday bash Monday night in a plaid set worthy of Cher Horowitz herself.

The pop superstar, 35, was photographed at the fête in Simkhai’s suiting-inspired Poppy vest and Payton wrap mini skirt — both of which sold out almost immediately.

She accessorized with sky-high burgundy Gucci platform heels and a sparkling Chanel pendant necklace, giving the schoolgirl classic a high-fashion twist.

Swift was joined by fiancé Travis Kelce , still in his Thom Browne shorts , along with Brittany Mahomes and guest of honor Patrick, at 1587 Prime steakhouse, the restaurant the Kansas City Chiefs’ stars co-own.

Despite the Chiefs’ loss to the Philadelphia Eagles on Sunday, the mood was all smiles. Country singer Kane Brown an

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