'Momager' Kris Jenner has opened up about cheating rumours surrounding daughter, Khloe Kardashian's boyfriend, Tristian Thompson.

Jenner, appeared on the Ellen DeGeneres show, a month after her daughter gave birth to her first child, True.

Asked about video footage seemingly showing Thompson cheating on her daughter with another woman a week before she was due to give birth to their child, Jenner said it was "unexpected".

"Khloe is amazing. I'm so proud of that kid. I get choked up because she's such a good mom and honestly I get so emotional," she said.

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Jenner said the family rallied around the 33-year-old after the cheating news surfaced, flying to Ohio, where she has set up house with her NBA star boyfriend.

"I think we do what we always do and spring into action with love and we all hopped on a plane and flew to Cleaveland because that is what we are known to do," she said.

Kardashian is yet to share any pictures of baby True.