@talk72000,
T,
Well yes and no. I have to search for Lata's acting clips, I remember watching one on national TV once.
But her affair with Madan Mohan seems to be just a speculation as she helrself gave it a rest quite early on, by started calling him "Madan Bhaiyya (Brother)". Madan Mohan was naughty in a playful way. He had great sense of humour.
Although there was a fling between her and Raj Kapoor for sure. There was a picture of her with Raj Kapoor, him playing Harmonium with one hand and playing fingers of his other hands in her hair.