the Jennifer Lopez movie where she has twins?

The movie you're looking for is called "The Back-up Plan". The film was released in 2010 and starred Jennifer Lopez as Zoe, a woman who uses a sperm donor to get pregnant. After becoming pregnant, she meets Stan (Alex O'Loughlin), a man she falls in love with. The movie follows the couple as they navigate the challenges of their relationship and the upcoming arrival of their twins.