Mila Kunis made her first public appearance since news was released that the "Black Swan" actress was pregnant with fiance Ashton Kutcher. A pregnant Mila Kunis showed off her baby bump and engagement ring from Ashton Kutcher at the "Jupiter Ascending" premiere, accompanied by co-star Channing Tatum.

Pregnant Mila Kunis showed off her tiny baby bump and huge engagement ring at the premiere of her new film "Jupiter Ascending" on Thursday, March 27 at Cinemacon in Las Vegas. She was accompanied by co-star Channing Tatum, at her first red carpet appearance since it was announced that she was pregnant.

Mila Kunis, 30, glowed in a sleeveless navy knee-length dress for the premiere, which perfectly flowed loosely around her tummy. She wore minimal makeup and kept her brunette locks down. Tatum, 33, seemed to strategically wrap his arms around her waist to hide her belly.

But there was one thing Mila wasn't trying to hide: that huge diamond engagement ring on her left hand!

As we previously reported, Mila Kunis was spotted in February wearing a huge engagement ring on her left hand. NYC jeweler Shari Fabrikant of Robert Fabrikant Inc. told Hollywood Life the ring must have cost at least $250,000!

"The stone looks like a pear shape diamond of at least five carats set in platinum. The stone is set simply with no diamonds around it. The band of the ring appears to be simple, however there might be small diamonds set in it, hard to see! This ring is all about the diamond! There are no embellishments. It is quite lovely in its simplicity. If ring is F VS1 could run app $250,000 and up," Shari said.

With that kind of ring, we're sure Kunis and Kutcher are getting married soon!

"That 70's Show" co-stars Kutcher, 36, and Kunis were first rumored to be dating in April 2012, after he separated from his wife of six years, Demi Moore, in November 2011.