The couple, who have been married since 2012, have already asked the three to be godmothers to their four-month-old daughter, reported Us magazine.
Amber revealed the news during an appearance on VH1's 'Big Morning Buzz Live'.
When asked if the rumour that she was a godparent was true, the 31-year-old star replied: "Yes, that is a fact."
All four actresses have remained friends since meeting on the set of the 2005 film and attended each other's weddings and have supported each other's careers.
Lively, 27 and 38-year-old Reynolds are yet to debut their four-month old daughter to the world.
