{blackbabes} Serena Williams fetes Caroline Wozniacki after marathon

1989 - Taylor Swift / NCIS / The Crazy Ones

Caroline Wozniacki celebrated finishing Sunday's New York City Marathon with good friends and good Champagne.

Wozniacki's pals, including fellow tennis player Serena Williams, feted the 24-year-old with a swanky dinner at STK Downtown.

A spy told Page Six the group of 10 ordered bottles of Champagne from both Veuve Clicquot and Moët & Chandon. In "great spirits," they sat under a giant sign that said "Congratulations Caroline."

Though Wozniacki was hungry, ordering a bone-in filet, she could barely walk after completing the race with a time of 3:26:33. To get to the ladies' room, she took an elevator to the second floor, so she wouldn't have to go up or down any steps, the spy said.

The group stayed for about four hours.

Williams, 33, was also at the marathon's finish line to support her friend.

Sunday's dinner capped off a week of unconventional training for Wozniacki, who stayed out until 4 a.m. at a Halloween bash, attended a Rangers game on Saturday night, where she ate two baskets of popcorn but no dinner, and chowed down on two bagels right before the big race.

On Oct. 24, Williams and Wozniacki were spotted together at a Mariah Carey concert in Singapore.