Meghan Markle is in New York City on best friend duty! The Duchess of Sussex flew to the Big Apple to see her pal Serena Williams play at the U.S. Open on Saturday. The last-minute trip came after Williams won Thursday night's match, putting her in the finals. Williams is eyeing her 24th Grand Slam title. If she clinches it, she'll tie the record for most wins with Margaret Smith Court. Meghan is said to have flown commercial amid backlash over recent private jet trips with Prince Harry.