Sunrise personality Samantha Armytage has been replaced as the host of a fundraising lunch honouring refugee women with US actress and UNHCR ambassador Kristin Davis, a day after the pair participated in an awkward Sex and the City skit on Channel Seven's breakfast television show.

Armytage was due to MC the $200-a-head lunch, organised for Australia for UNHCR, which kicked off at midday on Friday in The Ivy Ballroom in Sydney. During the event, Armytage was due to hold a question-and-answer session with Davis about her work with refugee women.

But Armytage and her co-host David Koch revealed on Sunrise on Friday morning that Armytage would no longer attend the event.