Jennifer Aniston goes for the plunge in a silky black gown for night out with fiance Justin Theroux

Racy Jennifer Aniston goes for the plunge in a silky black gown for night out with fianc Justin Theroux

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UPDATED:

11:34 GMT, 28 October 2012

Jennifer Aniston has made a number of low-key appearances on the social scene in the past week. But she saved the best for last as she wore a plunging black satin gown at Los Angeles County Museum of Art's star studded annual Art + Film Gala last night.

The actress made a rare red carpet appearance with her beau, actor Justin Theroux, who looked suitable suave in a tuxedo, as they posed together.

Eyes front: Justin Theroux avoids looking at fiancee Jennifer Aniston who is wearing quite a revealing gown as they attend LACMA 2012 Art + Film Gala

Eyes front: Justin Theroux avoids looking at fiancee Jennifer Aniston who is wearing quite a revealing gown as they attend LACMA 2012 Art + Film Gala

Eye-popping: Cameron keeps it demure as Jennifer takes centrestage with her plunging dress

Eye-popping: Cameron keeps it demure as Jennifer takes centrestage with her plunging dress

Upstaged: Salma Hayek kept her cleavage under wraps for once

Upstaged: Salma Hayek kept her cleavage under wraps for once

Jennifer's
stunning gown revealed rather a lot of cleavage, but a sheer net panel
prevented any chance of a wardrobe malfunction.

The couple bumped into fellow actor Drew Barrymore and husband and Will Kopelman inside the gala honoring Ed Ruscha and Stanley Kubrick presented by Gucci.

And
all red carpet poise was forgotten as the group huddled round Drew to
see pictures of her newborn daughter Olive on husband Will's iPhone.

Fancy seeing you here: Actresses Drew Barrymore (L) and Jennifer Aniston attend LACMA 2012 Art + Film Gala Honoring Ed Ruscha and Stanley Kubrick

Fancy seeing you here: Actresses Drew Barrymore (L) and Jennifer Aniston attend LACMA 2012 Art + Film Gala Honoring Ed Ruscha and Stanley Kubrick

The event marked the couple’s first official appearance since the baby’s birth just one month ago.

Also
at the star-studded event was Drew's Charlie’s Angels co-star Cameron
Diaz, as well as Minka Kelly, who starred on the recent Charlie’s Angels
television series.

She arrived separately from her rumoured new loved Chris Evans.

Art consultant Will Kopelman and actors Justin Theroux, Jennifer Aniston and Drew Barrymore attend LACMA 2012 Art + Film Gala

Art consultant Will Kopelman and actors Justin Theroux, Jennifer Aniston and Drew Barrymore attend LACMA 2012 Art + Film Gala

Adorable! Jennifer looks entranced as Will and Drew show off pictures of their daughter Olive

Adorable! Jennifer looks entranced as Will and Drew show off pictures of their daughter Olive

Robert Pattinson made a surprise solo
appearance, and the Twilight heartthrob was soon surrounded by the
ladies, including actresses Cameron Diaz and Amy Adams.

Evan Rachel Wood, Minka Kelly, Amber
Heard and a cleavage-baring Rosie Huntington-Whiteley upped the glamour
quota with a dress that revealed plenty of sideboob.

Rock the red carpet: Cameron Diaz chose a stunning shade of yellow, while Salma Hayek kept it conservative in blackDiaz arrives at LACMA 2012 Art + Film Gala at LACMA

Rock the red carpet: Cameron Diaz chose a stunning shade of yellow, while Salma Hayek kept it conservative in black

Rock the red carpet: Cameron Diaz chose a stunning shade of yellow, while Salma Hayek kept it conservative in black

You missed a bit: Rosie's dress appeared to be completely missing at the side

You missed a bit: Rosie's dress appeared to be completely missing at the side

British style on show: Rosie Huntington-Whiteley and Florence Welch wore vibrant jewel tones, and Florence provided the musical entertainment for the night

British style on show: Rosie Huntington-Whiteley and Florence Welch wore vibrant jewel tones, and Florence provided the musical entertainment for the night

British style on show: Rosie Huntington-Whiteley and Florence Welch wore vibrant jewel tones, and Florence provided the musical entertainment for the night

Actor Leonardo DiCaprio was co-chair on the night for the second year in a row while Florence + The Machine provided a live
performance as part of the Art + Film Gala's entertainment.

Among the other guests on hand for the fundraising fete were Karlie
Kloss, Ginnifer Goodwin, Kerry Washington, Jennifer Morrison, Bella
Heathcote, Amber Valletta and director Steven Spielberg, who ended up
taking the stage before night's end to toast the late filmmaker Stanley Kubrick.

Rolling solo: Robert Pattinson arrived alone but didn't stay lonely for long as actresses Cameron Diaz and Amy Adams fussed over him

You're a star: Singer PSY arrives at LACMA 2012 Art + Film Gala at LACMA

Rolling solo: Robert Pattinson arrived alone but didn't stay lonely for long as actresses Cameron Diaz and Amy Adams fussed over him, and right Gangnam singer PSY joins the stars