MGA Entertainment accused Gaga, 26, and her management and licensing companies of making an eleventh-hour request to remove a voice chip from the doll, jeopardizing its delivery to stores in time for Christmas, reported New York Daily News.
They also claim that Gaga acted in "bad faith" because she prefers the doll to come out when her new album and perfume are released in 2013.
In its Manhattan Supreme Court suit, MGA charged Gaga and her team "engaged in intentional and deliberate delays" to prevent it from meeting its summer deadline with distributors.
However, Gaga's spokesman Amanda Silverman said the singer's lawyers have not seen the court papers yet.
"Lady Gaga will vigorously defend MGA's ill-conceived lawsuit and is confident that she will prevail," Silverman said.
