Are Mila Kunis and Ashton Kucther engaged? Such is the question that left fans speculating after the brunette beauty's cryptic Instagram post. In the snapshot, the brunette beauty and her beau were kissing.

"Happily ever after," read Kunis' caption. Is the 'Black Swan' actress subtly saying that she will soon start a new life with the 'No Strings Attached' actor?

The two first met on the set of 'That '70s Show' in 1998. The then 20-year-old Kutcher played the role of Kelso. Kunis, then 15 years old, played the role of Kelso's girlfriend Jackie. In 2001, Kunis told Peopla magazine that Kutcher was her first kiss and that she was very nervous because he was her biggest crush.

An unnamed insider likewise claimed that while nothing really happened between the two during the filming of 'That '70s Show', Kutcher was reportedly enamored with "how beautiful Kunis was".

As an honor for Mila Kunis and Ashton Kutcher's engagement, here are some unforgettable Jackie and Kelso moments:

1. When Jackie and Kelso visited a sperm bank and Jackie admitted that she wanted to have "little Kelsos". Kelso, touched by the confession, kisses Jackie.

2. When Kelso writes a love song for Jackie despite his friends' weird stares.

3. When Kelso and Jackie defeated their friends in the Newlywed Game despite the difficult questions.

4. When Kelso allowed Jackie to put make-up on him in order to make her happy.

5. When Kelso becomes overly protective of Jackie and thinks she's cheating on him with a sausage guy.

What's your favorite Jackie and Kelso moment?