The TV presenter became the wife of US ad exec Brian Monet, 39, in an intimate London service on Saturday attended by 35 guests, says a source.
'She wanted to keep everything as low-key as possible this time so she invited only her closest friends,' the insider tells the Daily Mirror.
The reception is believed to have been held at a Kensington hotel.
The couple had their honeymoon in the Maldives before the ceremony because Ulrika, 40, is heavily pregnant with her fourth child.
She has previously been married to cameraman John Turnbull and reality show star Lance Gerrard-Wright.
Ulrika is already mum to Cameron, 13, from her marriage to John, daughter Bo, with hotel boss Markus Kempen, and Martha with Lance.
Her agent has not yet confirmed the good news.
Get more celeb news from Now Magazine