It's Official: Ashton Kutcher & Mila Kunis Are Engaged!

After weeks of did-they-or-didn't-they speculation, E! News finally confirms that Ashton Kutcher and Mila Kunis are, in fact, engaged to be married!

The Ted actress, 30, was spotted shopping with her mother on Thursday at The Grove in Los Angeles wearing a hefty diamond solitaire ring on that finger.

Related: Girls Star Allison Williams is Engaged!

Rumors first began surfacing in December when Kutcher, 36, accompanied Kunis to her brother's wedding in Florida, where she served as a bridesmaid. A source at the time told People that they've "talked about getting married for quite a while." Earlier this month, the couple were spotted celebrating another wedding: Kunis' twin brother, Michael, got married on St. Simons Island in Georgia.

The high-profile couple has been notoriously gun-shy about discussing their relationship to the press - Kutcher once told Elle that "people will fill in the blanks however they want" - or via social media, but that's changed in recent months. On Wednesday, Kunis posted the above photo on Instagram with the caption, "I love you @kutcher78."

And in a recent interview with Cosmopolitan, Kunis dished on their favorite dating ritual: White T-shirt night. "It's when you wear jeans and a white T-shirt and you go on a date. Nothing fancy, it's just something that you love to do. And whether that's bowling or dinner or going to a cheese shop and have some wine or walking around," she says.

The former That '70s Show cast mates took their friendship to the next level in April of 2012 - seven months after Kutcher split from ex-wife Demi Moore. (Fun fact: Kunis's first kiss was with Kutcher. "I had the biggest crush on him," she confessed to People.)

UPDATE: A source revealed to Us Weekly that Kutcher proposed about a month ago: "It was very sweet and simple," and only family and close friends knew about it. In fact, he wanted to pop the question sooner but was forced to wait because he had to finalize his divorce proceedings with Moore. Therefore, it won't be a long engagement - "He wants to marry her soon and start their life together."

Congratulations to the happy couple! Let the wedding countdown begin...Plus, check out more Celebrity Engagement Predictions for 2014.

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By Stefania Sainato