25-year-old has shown her love for the Hammers by donning the claret and blue kit.
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Khalifa, who boasts eight million Instagram followers, uploaded the snap to her loyal fan base.
Alongside an image of her drinking coffee with the West Ham shirt on, she wrote: “Next years’ our year #ForeverBlowingBubbles #AndForeverEatingWaffles”
The American was relaxing at Duck and Waffle, enjoying the views from the 40th floor of Heron Tower in London.
She shot to fame on the adult website by becoming the most searched performer on PornHub.
Khalifa since forged a successful career as a sports reporter and showed her sympathy for Liverpool Loris Karius after his Champions League howler.
And she’ll be hoping new West Ham boss Manuel Pellegrini can hit the ground running from the off on his return to the Premier League.
He has already strengthened his side with the signings of Issa Diop, Lukasz Fabianski and Ryan Fredericks.