The big screen has gifted us with some sizzling on-screen romances over the years, but which celebrity duo truly set the screen on fire with their undeniable chemistry?

Some contenders that come to mind:

1. Brad Pitt & Angelina Jolie in "Mr. & Mrs. Smith" - Their explosive chemistry not only made for a blockbuster movie but also sparked a real-life romance that captivated the world.

2. Ryan Gosling & Rachel McAdams in "The Notebook" - Their passionate love story in this classic romance film made hearts flutter and left a lasting impression on pop culture.

3. Leonardo DiCaprio & Kate Winslet in "Titanic" - Their tragic yet beautiful love story aboard the ill-fated ship remains one of the most iconic on-screen romances of all time.

4. Emma Stone & Ryan Gosling in "Crazy, Stupid, Love" - These two have shared the screen multiple times, but their magnetic presence in this romantic comedy is unforgettable.

5. Jennifer Lopez & George Clooney in "Out of Sight" - Their steamy chemistry in this crime romance had audiences hooked from start to finish.

Which celebrity pairing do you think had the hottest on-screen chemistry? Did I miss any unforgettable duos? Let's discuss and rank our favorites!