Even Britney Spears has an opinion on the Justin Bieber's challenge to Tom Cruise to take on the Mission Impossibe actor in the Octagon!

Not surprisingly, the story came across Brit's radar and while she didn't want to pick a winner, she did comment that the two unlikely opponents are an "odd match up." To say the least!

We caught up with Brit Friday at Nordstrom in Calabasas at The Oaks mall; she wore a red off-the-shoulder top and denim cut-offs with Birkenstocks for the outing. She was escorted by a bodyguard who carried her bag and drove her Mercedes and while the star clearly has to travel with protection, we're wondering why her security detail isn't boyfriend Sam Asghari, a personal trainer who, frankly, looks more physically imposing than this dude! Where's Sam?!