The couple tied the knot in 2004 after a short engagement, and had sons Sean Preston and Jayden James in 2005 and 2006 respectively.
However, Spears filed for divorce just months after Jayden's birth, with Federline eventually granted sole physical custody after the 'Toxic' singer - in the midst of her widely-reported 'meltdown' - locked herself in a room with the youngest son and refused to relinquish custody.
Yesterday both stars looked relaxed as they took in the game; Britney looking smart in a red polo-neck top and her hair tied back into a loose bun.
Kevin didn't appear to be too happy with the photographers who took the snaps, and is seen in a few pics shooting daggers in the direction of the cameras.
Britney is clearly working a great balance between her professional and personal commitments, as she is currently in the midst of preparing her 8th studio album Britney Jean.
The record, led by the single 'Work B***h', is out on December 2 in the UK, and the artwork was released on Friday - showing her in black-and-white with the title written in neon lights.
She's then kicking off a two-year-long residency in Las Vegas on December 27.
