Wambui Otieno Mbugua, the 67-year-old woman who married a man 42 years younger than her, has blasted a group of Kenya's MPs as "disgusting".
Wambui Otieno Mbugua says she is fighting for women's' rights
They jeered her when she turned up at a constitutional conference in the capital, Nairobi.
Her wedding a month ago was hugely controversial, even sparking a row between Kenya's churches.
But Ms Wambui said women at the conference were singing in her support.
"Women in Kenya must be given a chance," she told the BBC's Focus on Africa programme.
The former freedom fighter said she was attending the conference, which is drawing up Kenya's new constitution following the change of power in December, as an "observer".
The Daily Nation newspaper reports that her arrival led to a 30-minute halt in the debates, as session chairman Wilfred ole Kena tried to cool tempers.
MP Bonny Khalwale led the male MPs who were wanted her to be ejected.
"We are discussing African culture and what she did negated the very concept of our culture," he said.
But conference delegate Hubbie Hussein spoke out in her support.
"There are land grabbers, looters, murderers and other criminals among the delegates, but no one has questioned their presence in the conference," she asked.
One of the key questions to be determined at the conference is whether Kenya should have a prime minister as well as a president and what powers should go with the post.