The name applied to any
child of an illegitimate
relationship, generally between two rich celebrities. In almost all cases, the rubber has broken or the child is otherwise an accident during a small 3 week fling, and instead of just calling it a "bastard
baby", spindoctor's have coined the word "lovechild."
Did you hear about celebrity "X" and "Y"? They got drunk one night after a big Hollywood party, one
thing led to another and the next
thing...."X" gave birth to a lovechild, who "Y" has not nor ever
will care about or wish to see.