Britney Spears has been slammed by Pink for driving her car with her baby son on her lap.
The 'Toxic' singer sparked outrage earlier this week when she was snapped behind the wheel with four-month-old Sean Preston perched on her knee instead of being secured in a baby seat.
Pink has reportedly being telling friends she believes the 24-year-old star is too young to have a child and has privately attacked her for behaving irresponsibly.
A friend of Pink's is quoted on the MSNBC website as saying: "She's always been disgusted by the Mickey Mousers' values and just doesn't understand Britney's decision to rush off and have a child so quickly."
It is not the first time Pink has criticised Britney.
The 'Stupid Girls' singer recently mocked the beautiful star, who is married to Kevin Federline, when asked if she was planning on starting a family now she has tied the knot with motocross racer Carey Hart.
Pink fumed: "F**k no. I'm not gonna do a Britney and pop out some kids. I'm not a Happy Meal. My husband's got the burger, but he's not getting the fries and shake to go with it."