New reports are claiming that Mila Kunis and Ashton Kutcher have secretly been engaged since the summer.

The "Two and a Half Men" star, who has been dating his former "That 70's Show" costar since spring 2012, is said to have officially put a ring on it!

According to HELLO! Magazine, the actor proposed to his girlfriend on her birthday back in August.

An insider told In Touch, "It happened over the summer," adding, "Ashton's whole family had come out to California for Mila's birthday [on Aug. 14], and he did it then.

"They couldn't go public with [the engagement] until his divorce was final. Now nothing should be standing in their way."

Kutcher, 35, split from ex-wife Demi Moore, 51, following six years of marriage. Their bitter divorce was recently finalized and now the actor is free to move on with his life without any baggage.

It took the former couple two years after announcing their separation to settle things in court. It was rumored that paperwork was delayed due to disagreements about finances.

Back in September, Mila Kunis, 30, was snapped wearing a s simple gold band on her engagement finger, fuelling rumors that the couple was engaged and planning to walk down the aisle.

A fan spilled to E! News that during a recent trip to the yogurt shop the actress was wearing a ring on her finger.

The witness explained, "She was wearing a small ring on her left hand," adding, "It was petite, but still noticeable and pretty.

"Mila looked really gorgeous and happy. They came into the store hand-in-hand and smiling. They looked like a cute couple."

[See photo HERE]

The actors played on-screen couple Jackie and Kelso for eight years. While Ashton ended up marrying Demi Moore, Mila Kunis dated child star Macaulay Culkin from 2002 to 2010 until the costars eventually came back together and fell in love.