Because Kat was a new face at the time and Lara was Miss Universe, so much higher in popularity. Kat has already worked opposite Salman in MPKK.
I doubt playing a single mother at that age would suit Kat, since those films were gonna either make or break her career. Even Salman knew it would've been bad for her career.
Plus they needed someone glamorous opposite Govinda and when u have Govinda it doesn't matter who the heroine is, coz he is all your gonna watch 😆
It was after Partner that she became a huge name and gradually went on the road towards becoming an A Lister.
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