As Prem and Jenny's relationship deepens, they face opposition from their families due to their different religious backgrounds. Despite this, they continue to see each other in secret.

The movie ultimately ends on a positive note, highlighting the importance of love, understanding, and acceptance.

In an attempt to bring Prem and Jenny together, their friends and family members hatch a plan to play a series of pranks and tricks on Prem's family, which leads to a lot of confusion and chaos.

The story begins with a young boy named Prem (played by Ranbir Kapoor) who lives in a small town in Punjab. Prem is a carefree and romantic young man who believes in the power of love. He falls in love with a beautiful girl named Jenny (played by Katrina Kaif), who is a Christian.

As the story reaches its climax, Prem's family finally realizes the power of love and accepts Jenny as their daughter-in-law. The movie ends with Prem and Jenny's families coming together to celebrate their love and marriage.

Meanwhile, Prem's family is arranging for him to marry another girl, Reshma (played by Saurabh Shukla's daughter, Nandini Shukla), but Prem is not interested.

Throughout the movie, the themes of love, family, and relationships are explored in a humorous and entertaining way. The "Ajab" (strange) and "Ghazab" (astonishing) elements of the story are intertwined as Prem and Jenny navigate their way through the challenges of their relationship.