That's My Boy was just as bad, if not worse, than Rock of Ages. The R-rated comedy debuted to an estimated $4.6 million from 3,030 locations, which is the lowest opening for an Adam Sandler live-action comedy in at least a decade. It was also just over half of Sandler's last R-rated effort Funny People ($8.69 million), which is widely considered one of his biggest flops to date. The movie could finish the weekend with under $13 million, which would be a truly devastating result from one of the most consistent box office performers of the past decade.
The naval war film, which sees the singer in her first major role, cost $209 million (£133m) to make but only took $25.3 million (£16m) in its first weekend.