Screen Actors Guild (SAG) Awards 2015 - The month of January is usually the time for the prestigious awards season, from the Golden Globes to SAG to the Oscars. And fashion observers noticed that plunging neckline and cleavage-baring outfits seemed to be the trend among female celebrities.

Aside from the SAG Awards 2015 winners, one of the most highly-anticipated during the awards season is the fashion trend and who among the attendees are the best dressed or the worst on the red carpet. This year, it appeared that cleavage-baring dresses are a major hit this season.

Who can forget Jennifer Lopez's almost nip slip incident at the Golden Globes with her stunning low-cut Zuhair Murad gown? However, the most stand-out among the celebrities with plunging neckline outfits was Jennifer Aniston. Hollywood Life shared Aniston's SAG attire was a vintage Galliano gown while her Critics' Choice suit was a Gucci Spring 2015 peak-lapel two button tuxedo.

Despite several snubs for acting awards, Jennifer Aniston was quite a showstopper during the awards season. And her dress choices at the awards night simply defined the "Cake" actress' effortless sense of style. With her low-cut outfits, Aniston proved that her best accessory at the red carpet was her cleavage and svelte physique.

Meanwhile, Jennifer Aniston's choice of attire was not the only one that stood out during the SAG Awards 2015. The Independent UK cited that 47-year-old Julia Robert's tight-fitting Givenchy tuxedo by Riccardo Tisci was also hard to miss.    

The SAG Awards 2015 red carpet was never overlooked because it provide a prime opportunity for A-list celebrities to show off their show-stopping fashion sense through their selected attires. It was also a chance for red carpet enthusiasts to name the best and worst dressed of the evening.

Among the best dressed that Vogue cited for the SAG Awards 2015 were Emma Stone in Dior Haute Couture and Repossi jewelry, Claire Danes in Marc Jacobs, Keira Knightley in Erdem and Repossi jewelry, Julianne Moore in Givenchy, Felicity Jones in Balenciaga and Van Cleef & Arpels jewelry and Reese Witherspoon in Giorgio Armani and Harry Winston jewelry.

While Ok! Magazine listed the worst dressed that include Rashida Jones in Emanuel Ungaro monochrome dress, Lorelei Linklater in flared sleeves and baggy lace inserts Honor dress and Laverne Cox in shiny satin Johanna Johnson dress.

And as for Jennifer Aniston and Julia Roberts, they're definitely two of the best dressed. They also proved that at their age, it okay to be sexy and to flaunt a little bit of skin as their low-cut outfits rocked the SAG Awards 2015 red carpet. And Aniston and Roberts just totally nailed it!