Calling Maury Povich!
Phillippe, who already has two children Ava, 11, and Deacon, seven, with his ex-wife, actress Reese Witherspoon, said he will "gladly" take a DNA test after Alexis Knapp's baby is born, according to TMZ sources.
The 36-year-old "Crash" star has reportedly said he does not want to take a prenatal paternity test as there is a slight risk of miscarriage.
Phillippe, who stopped seeing Knapp in September last year, said he will provide support for the unborn child if it is proved he is the father.
The baby is due in June.