The actress, 55, was nominated for her role in The Morning Show but lost out to The Crown‘s Elizabeth Debicki.

She also took to the stage alongside Bradley Cooper to present the SAG Lifetime Achievement Award to Barbra Streisand.

Jennifer dazzled at the ceremony in a figure-hugging silver dress that boasted a plunging neckline and a thigh-high slit.

But the most eye-catching part of her ensemble was her jewellery, with the Friends star sporting a huge sparkler on her ring finger.

Jennifer Aniston has sparked engagement rumours after she posed at the SAG Awards while wearing a giant diamond ring on her left hand

But the most eye-catching part of her ensemble was her jewellery, with the Friends star sporting a huge sparkler on her ring finger

The actress, 55, dazzled at the ceremony in a figure-hugging silver dress that boasted a plunging neckline and a thigh-high slit

Jennifer is not known to be dating anyone currently, and has not been romantically linked to anyone for the past five years.

MailOnline has contacted representatives for Jennifer Aniston for comment.

Jennifer has been married twice before, first famously to Brad Pitt in 2000 before their split in 2005, which became one of the most high-profile divorces in Hollywood.

She then got engaged to Justin Theroux in 2012 and they tied the knot three years later, but then also separated in 2018.

She has also previously dated fellow famous faces, Paul Rudd, Tate Donovan, Vince Vaughn and John Mayer.

Despite a rocky relationship history, Jennifer is reportedly optimistic she will find love again in her 50s.

Last summer, a source told UsWeekly: ‘In her gut, Jen believes she’ll eventually meet the right person.’

But the insider also added that if she never finds love again, she will be just fine, saying: ‘She’s not going to beat herself up if it doesn’t happen. She is fine on her own.

The ring was evident as she posed with guests including American singer and actress Ciara

Jennifer has been married twice before, first famously to Brad Pitt in 2000 before their split in 2005, which became one of the most high-profile divorces in Hollywood (pictured in 2004)

She then got engaged to Justin Theroux in 2012 and they tied the knot three years later, but then also separated in 2018 (pictured together in 2016)

‘[Jennifer] is in a great place. She’s happy, healthy and fulfilled by her career, family and friends. [She’s] been through a lot, but she feels blessed to be thriving personally and professionally.’

Jennifer herself admitted she would ‘love a relationship’ in November 2022, but also said that she wasn’t ‘interested’ in getting married again.

When asked if she planned to walk down the aisle once again in the future, she told Allure: ‘Never say never, but I don’t have any interest.’

However, she confessed she would still be open to love as being single could sometimes be overwhelming.

Jennifer said: ‘I’d love a relationship. Who knows? There are moments I want to just crawl up in a ball and say, “I need support.”‘

‘It would be wonderful to come home and fall into somebody’s arms and say, “That was a tough day”.’

But the Morning Show star clarified that she didn’t want to start a new relationship until she had had time to work on herself and address her early traumas.

She explained: ‘It wouldn’t be fair. I don’t want to move into a house when there are no walls.’

Jennifer herself admitted she would ‘love a relationship’ in November 2022, but also said that she wasn’t ‘interested’ in getting married again (pictured in 2020)

Last year, Jennifer opened up further on the impact of her childhood on her love life, admitting her romantic relationships have been negatively impacted by her parents’ bitter split.

She admitted that her ‘difficult’ childhood experiences have not left her desperate to say ‘I do’.

‘It was always a little bit difficult for me in relationships, I think, because I really was kind of alone,’ she explained in an interview with WSJ. Magazine.

‘I don’t know. My parents, watching my family’s relationship, didn’t make me kind of go, “Oh, I can’t wait to do that”,’ she said, referring to her father John Aniston and her mother Nancy Dow.

John, who sadly passed away in November 2022, married Nancy in 1965 – but the couple’s relationship ended when Jennifer was just nine years old, and they got divorced in 1980.

Speaking about the long-term effects that their tumultuous divorce had on her, Jennifer admitted it felt ‘easier’ to just be alone.

She said: ‘I didn’t like the idea of sacrificing who you were or what you needed, so I didn’t really know how to do that.

Last year, Jennifer opened up further on the impact of her childhood on her love life, admitting her romantic relationships have been negatively impacted by her parents’ bitter split (pictured with mum Nancy Dow and dad John Aniston)

‘So it was almost easier to just be kind of solo. So I didn’t have any real training in that give-and-take.’

The Along Came Polly star said now she is focused on making sure she doesn’t sacrifice her own desires to please another person.

Jennifer explained: ‘It’s just about not being afraid to say what you need and what you want. And it’s still a challenge for me in a relationship.’

‘I’m really good at every other job I have, and that’s sort of the one area that’s a little….’ she added before trailing off and joking that her dog is who she’s ‘sleeping with’.

The actress and her sparkling ring on the red carpet at the Screen Actors Guild Awards

The sparking ring caught the eye as she welcomed screen and stage legend Barbra Streisand onto the stage