Isla Fisher flashes undergarments in revealing dress with thigh-high slit

She's not the first celeb to flash her skivvies ...

Isla Fisher gave everyone at the AACTA Awards a peep show on Wednesday night -- but she probably had no idea!

The fiery redhead, who wore a stunning Alex Perry backless polka-dot frock, flashed her nude Spanx as she was about to sit down. Fisher look unfazed as she leaned over to talk to husband Sacha Baron Cohen about something on his phone.

6th AACTA Awards Presented by Foxtel  Ceremony
6th AACTA Awards Presented by Foxtel Ceremony

Getty

The 40-year-old actress received was at the Australian award show to receive the Trailblazer award and her acceptance speech didn't go unnoticed.

She hilariously thanked president-elect Donald Trump for "showing the world that unqualified orange people can win things."

Fisher also pulled a Melania Trump by repeating parts of a speech by Michelle Obama.

"From a young age my parents impressed on me the values that you work hard for what you want in this life, that your word is your bond, you say what you want to do and you keep your promises, that you treat people with respect," she said before saying she also copied the words from the first lady.

It looked like an incredible night out for Fisher and her husband of almost seven years. The two looked totally in love with each other on the red carpet!

The "Wedding Crashers" actress spilled the beans a couple of weeks ago by revealing that a sequel is in the works! She said former co-star Vince Vaughn dropped the bombshell at a party.

RELATED: Melania Trump's style over the years:

This content is not available due to your privacy preferences.
Update your settings here to see it.