The 47-year-old actress worked the red carpet in a plunging black Givenchy jumpsuit at The Shrine Auditorium in Los Angeles on Sunday night.
At last year's ceremony, Julia wore a bright pink, wide-leg Valentino number but this year she played it classic in custom-made corseted style.
Think sharp, think sexy androgynous vibe - paired with black peep-toe heels, boxy clutch and diamond Tiffany & Co. jewellery.
Julia is fronting Givenchy's Spring/Summer 2015 ad campaign (photographed by industry legends Mert Alas and Marcus Piggott) so it makes perfect sense that she wore the designer to the star-studded event.
The lady does the jumpsuit trend very well.
All eyes were on Roberts in this figure-flaunting look and while she lost out on winning the Outstanding Performance by a Female Actor in a TV Movie or Miniseries award for her role as Dr. Emma Brookner in The Normal Heart - she was all smiles all evening.
Note how the signature red tresses are back. And can we talk about how amazing her skin looks? Does she ever even age?
We love a good jumpsuit and we're all for seeing the stars style them out on the red carpet. The big question is, will we see them at this year's Oscars?
Love red carpet style? Flick through this gallery to see more from the 2015 SAGs...
MORE: Catch up on all the latest from Sunday night's sparkly Screen Actor's Guild Awards right here.