Deepika Padukone had a grand debut with Farah Khan's Om Shanti Om, which came out in 2007. Since it's about revising some of her most memorable scenes till date, her grand entry in the film's premier within the film is the best way to start the list:

1. Om Shanti Om (2007)

As aforementioned, Padukone plays a star called Shanti Priya our protagonist Om Prakash Makhija is smitten by, played with gusto by Shah Rukh Khan. When they first meet, she's walking on the red carpet and he's in the crowd to witness her aura and hysteria. Vishal-Shekhar's charming Aankhon Mein Teri plays in the background as Khan's hand accidentally gets stuck in her Dupatta. It's fitting that the film was based in the 70s, and the two could have an intimate moment, or else Om would be thrown away by a bunch of bodyguards.