The actress - who plays Pam in the comedy - married writer boyfriend Lee Kirk in a private ceremony earlier this month.
According to People, the ceremony was officiated by Probst, who is an ordained minister in the Universal Life Church and close friend to Fischer.
He reportedly flew to Los Angeles from the set of Survivor: Nicaragua to attend the nuptials before immediately returning to filming.
Fischer and Kirk became engaged during a vacation around Europe last year. They have been dating since January 2008.
The actress's co-star Rainn Wilson recently tweeted that the wedding had been "beautiful".