Kirshen came through his semi-final of the NBC programme last night, while Yashere succeeded last week.
The other finalists are Americans Doug Benson, Lavell Crawford, Dante,Raplh Harris, Jon Reep and Amy Schumer, plus Canadians Gerry Dee and Debra Di Giovanni.
From now on, viewers will vote off one act each week until a winner is selected, who will win $250,000, an exclusive contract with NBC Universal and their own half-hour comedy special on Bravo.
However, all the finalists can expect a major boost to their profile in the US.
This is the first time in four years that the show has looked outside America for comics, holding auditions in London, Montreal and Sydney.
Yashere got through the Sydney heat, where she was on tour at time, while Kirshen succeeded in London alongside Junior Simpson, Ava Vidal and Spencer Brown.
However, despite his victory in London, Simpson was not invited back for the next round in Los Angeles, where Brown was eliminated. Vidal was forced to drop out because of a delay getting her visa.
