The 30-year-old brunette beauty was spotted shopping on Thursday wearing a large diamond ring on that finger, and a source confirmed to E! News exclusively that the former That 70's Show co-stars are indeed planning to make it official.
The lovebirds have been dating for almost two years. Fans of the classic sitcom were first treated to signs of Jackie and Kelso's real-life coupling back in April 2012, though it took a number of months for them to be more public with their romance.
But Mila and Ashton's engagement wasn't the only story that had people talking. Take a look at the other big articles of the week!
Justin Timberlake Gets Flipped Off by a Fan in Concert: What would you do if you were performing a song and a fan flipped you off mid-concert? Well, we can tell you what Justin Timberlake did. He returned the favor.
During Timberlake's 20/20 Experience concert tour stop in Philadelphia, the 33-year-old singer got a surprising and rude hand gesture from a female fan who was watching from the audience.
"I'm excited to be here," Timberlake said charmingly from the stage (in a video courtesy of @StephLough). "I've got some good friends in Philly."
Watch the video now to see how the incident went down!
Adam Sandler Sings About Loving Drew Barrymore's Boobs on The Tonight Show: It's a 50 First Dates and Wedding Singer reunion!
Adam Sandler and Drew Barrymore made a joint appearance on Wednesday's Tonight Show Starring Jimmy Fallon, where they performed an original song about their undeniable chemistry and mutual admiration.
The voluptuous Modern Family star was photographed filming some scenes for the popular sitcom on Feb. 20 in Australia.
The Colombian bombshell accentuated her killer curves and sported a colorful Agent Provocateur Mazzy monokini for the day at Bondi Beach. Vergara's sexy one-piece paneled bandage design featured plenty of cutouts, hot pinks straps and patches of orange and lime green.
Vergara finished the vibrant look with a long flowing pleated purple skirt, hoop earrings and bold red lipstick.
Katy Perry and John Mayer Split: Katy Perry and John Mayer have called it quits again, E! News has exclusively confirmed. A source explained that Perry's upcoming world tour was a big issue for her and Mayer, saying the "Dark Horse" singer was definitely putting her work first, but adding that it's unclear whether or not her tour was the actual final straw. The two first went public with their off-and-on romance in summer 2012. They split briefly, reconciled, called things off again last March, but then seemed to be going strong once again.