Brittany Mahomes celebrated in style as she jetted off on a weekend getaway with her friends in honor of her 30th birthday. Ahead of her milestone celebration on Sunday, August 31, Mahomes reposted her friends Lyndsay Bell and Cass Greinert's Friday, August 29, Instagram Story photo of the Kansas City Chiefs WAG boarding a specially-decorated private plane. "Celebrating our girl all weekend," Bell announced to her Instagram followers.