"She is very happy for Bella," said a source.
The 49-year-old actress did not know about the wedding beforehand but she wants best for Bella.
"She, like all mothers, wants her child to be happy, and it surely seems Bella is very happy," the source added.
The newlyweds, who married at London's Dorchester Hotel after dating for less than a year, wanted a low-key and intimate celebration.
Bella's father, Tom Cruise, and older brother, Connor, were also absent from the festivities.