Evangeline Lilly is pregnant with her second child

Los Angeles - Evangeline Lilly is pregnant with her second child.

The 35-year-old actress - who already has four-year-old son Kahekili with long-term boyfriend Norman Kali - showed off her growing baby bump in a monochrome one-shouldered dress at the Hollywood premiere of her new movie Ant-Man on Monday night.

(Greatstock/Splash)

The premiere, which was held at the Dolby Theatre, marked the first time the Lost actress had walked the red carpet since the Hobbit: The Battle of the Five Armies premiere in December 2014.

It is not clear yet when Evangeline is due to give birth, or if she knows the gender of her unborn tot.

The brunette beauty previously admitted she loved being pregnant with Kahekili.

She said: "What I wanted originally was six kids. I frickin' love being pregnant. I'm one of the lucky women who just had a blissful pregnancy."

And though she wants a large family, the actress is keen to adopt as well, but has found the process tough.

She added: "I wanted to adopt four.

"My partner and I have really been through the ringer in the adoption world and it's hard, so we'll see what happens. Life is magically beautiful, and it brings you what is perfect."