As rumors continue to alleged that they are engaged Mila Kunis and Ashton Kutcher took a walk down the aisle over the weekend, the only thing is that they weren't celebrating their wedding day. Instead the "Family Guy" actress brought her boyfriend along as her date to her brother's nuptials.

According to E! News, the "Ted" star wore a pink strapless dress as she served as bridesmaid for her sibling's Michael Kunis' wedding in St. Petersburg, Florida, on Saturday.

As Ashton Kutcher tagged along for support the brunette beauty was still wearing a ring on her left hand with many speculating that it was the starlet's engagement ring.

A source told the celebrity news site, "Mila wore a gold band on her engagement ring finger but it didn't have a diamond, just a simple gold band similar to a wedding band."

The insider went on to say, "Mila was very happy for her brother and his wife. During the ceremony, she stood at the altar and seemed very focused on the vows."

As the ceremony continued the source explained, "Every once in a while, [Mila] would look out to Ashton and make eye contact with him," adding, "Ashton was very supportive of Mila and happy for the family.

"He was joking around with Mila's brother and they invited him to come and pose for family pictures with the bride and groom after the wedding."

The insider revealed that the couple looked "totally in love and inseparable at the wedding."

The source went on to say, "They rarely left each other's sides and were always holding hands and whispering to one another," adding, "Ashton let Mila do her thing but always was right there at her side. If she was busy, he knew lots of people to talk to and was having a great time with her parents and friends.

"It was a really happy occasion for the family and a great day for everyone."

Following the nuptials the guests headed over to the reception which was held at the historic St. Petersburg Yacht Club.

For photos of Mila Kunis and Ashton Kutcher at her brother's wedding click HERE.