By Andrew Holleran Josh Allen is off to a truly insane start on Sunday afternoon. The Buffalo Bills quarterback has thrown for nearly 350 yards and four touchdowns – in the first half! Buffalo is crushing Pittsburgh, 31-3, late in the second quarter on Sunday afternoon. The rout is on. Following the game – potentially a record-breaking one for Allen and the Bills – we should see the star quarterback celebrating with his girlfriend. Brittany Morgan Williams, the girlfriend of the MVP candidate quarterback, shared some cute photos on her social media. Fans love the happy couple. “The cutest 😍😍,”…