Kumar arrived at 10 Circular road residence of Rabri Devi to take part in the feast organised on the occasion of Makar Sankranti.
Host Prasad and his wife Rabri Devi served "Dahi" (curd) and "Chura" (beaten rice) to the chief minister and other visitors.
Prasad applied a 'teeka' of curd on the forehead of Nitish Kumar after which the two embraced each other to the delight of the shutterbugs.
Prasad told reporters that the 'teeka' was for smooth functioning of the secular government in the state.
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Prasad was in action welcoming and greeting people who had thronged at the feast in large number.
Prasad's younger son and Deputy Chief Minister Tejaswi Yadav sat next to Kumar and was seen taking selfie with the CM.
His brother and Health Minister Tej Pratap Yadav was also seen according warm reception to the CM and other leaders of the coalition.
Kumar, Prasad, Sharad Yadav, state Congress President and minister Ashok Choudhary and other enjoyed 'dahi-chura' and 'tilkut' at the feast.
When reporters asked Sharad Yadav if Makar Sankranti would further sweeten relations among alliance partners, he said the voters had given the direction to work together by providing a thumping majority in the Assembly poll.