If she is, then it depends on who could have got her pregnant. When was the last time she slept with someone else? If it was a long time ago, then the baby is definitely your friend's. If it was more recently, then she should get checked at the doctor's so that he can tell her how many weeks pregnant she is. If, for example, she's two months pregnant, and the last time she slept with another guy was four months ago, it must be your friend's.

If she's been sleeping with different guys at around the time of the conception, then the only real way to tell is through DNA testing.

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I'll move to Paris, shoot some heroin, and fǜck with the stars.
You man the island and the cocaine and the elegant cars.