Sandra Bullock's 'The Blind Side' co-star Quinton Arnold, who played her adoptive son in the hit movie, is speaking out about the actresses' surprise baby news!

"I am truly overjoyed for Sandra -- what amazing news and so special that she has been able to keep this time private between her and the baby," the actor tells People.com. "Just as she played an exceptional mother in 'The Blind Side,' her caring nature will make her an amazing mother to Louis!"

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