After over four year together and a brief breakup in 2011, Justin Timberlake and Jessica Biel are engaged, with Timberlake proposing in the snowy mountains of Jackson, Wyo. over the holidays.

But how did Timberlake propose to Biel? Has their engagement been confirmed? And if they are engaged, then how did they recover from their brief break back in March 2011 so quickly? Below, here's all the details we know so far about Justin Timberlake and Jessica Biel getting engaged.

'He knew it was the right time.'

According to a US Weekly insider, Timberlake popped the question while the pair were doing snow sports in Wyoming.

Justin knows how much she loves snowboarding and the mountains, so it was the perfect place, the source said. He knew it was the right time to porpose.

So far, Justin Timberlake and Jessica Biel have only confirmed the news to family and friends, and their reps have declined to confirm or deny the engagement rumors.

Unlike other celebrity couples, however, keeping the details (if not the PDA) of their relationship out of the public eye is nothing new to Timberlake or Biel.

And even though the jewelry store that allegedly tweeted the news denies the rumor, the lack of comment from either star keep fueling rumors that the engagement is for real.

It's the most precious thing that I have in my life, and I care about it so much that I don't care about what anyone says or thinks, Biel told Vogue of her relationship with Timberlake.

It's mine. And I really like that about it.

From Splitsville to 'I Do'

But how did Timberlake, 30, and Biel, 29, get from a break-up to an engagement in a matter of months? Justin and Jessica split up in March 2011, though they were back together again by the summer.

In fact, celebrity bloggers at PopSugar feel that the time apart may have been what convinced Timberlake that the actress was the woman he wanted to marry. Even when the pair were apart, Justin Timberlake told Vanity Faire that his ex remained the single-handedly most significant person in my life.

When the couple reunited, meanwhile, they were spotted much more frequently together, with Timberlake spotted biking with Biel in Toronto when the actress was filming Total Recall, and she went to support the six-tiem Grammy winner at a golf tournament earlier in the year.

The pair even attended a high-publicity dinner at Timberlake's restaurant Southern Hospitality with superstar Elton John.

When things began to get serious, they had a conversation about taking the next step, and were seen on a double date with Biel's parents in October, according to the Huffington Post.

According to another Timberlake insider, the actor has never been happier. And while fans of both stars wait to hear if the engagement will be confirmed, many hope that the pair's love will hold.