Style chameleon! Olivia Munn is casual in jeans and military jacket...before transforming into the belle of the ball in canary yellow lace dress

As an actress she's used to quick costume changes.

So for Olivia Munn, going from dressed down chic to glamorous red carpet siren is all in a day's work.

The 32-year-old looked stylish in skinny jeans a military jacket as she enjoyed a shopping trip with friends in New York City on Tuesday.

And later in the day, the actress slipped into an elegant canary yellow lace gown as she left the Bowery Hotel for the Time 100 Gala at Lincoln Center.

A lesson in opposites: Olivia Munn  looked laid-back and casual for a shopping trip on Tuesday in New York before transforming into a glamorous screen siren in a yellow gown as she left her hotel for the Time 100 Gala at Lincoln Center

The Newsroom star showed off her off-duty style in the dark wash jeans, which she paired with brown leather ankle boots and a brown sweater as she strolled through the Nolita neighbourhood with two girlfriends.

Olivia kept warm with an olive-green military-style jacket and an over-sized white scarf tied in a loose knot around her neck.

She accessorised with a dainty black handbag and tortoiseshell shades, while scraping her dark hair back into a sleek ponytail.

Girls' trip: The 31-year-old wore skinny jeans, ankle boots and a green military jacket as she strolled around the Nolita neighbourhood with two girlfriends

Off-duty style: Olivia wore tortoiseshell sunglasses and scraped her dark hair back into a sleek ponytail

The star kept her makeup simple, adding a rosy glow to her cheeks with a swipe of blusher and opting for a nude lip gloss.

She wore a pair of thin silver hoop earrings, which added elegance to the laid-back look.

Olivia appeared to be having a ball with her two pals as they laughed and chatted while enjoying the early spring day together.

Sharing a joke: The star looked to be having a ball with her friends as she laughed and chatted with them while enjoying the early spring day

Olivia was then spotted looking the height of sophistication in a figure-hugging sleeveless yellow lace dress as she left the Bowery Hotel in Manhattan later that day.

She looked gorgeous in the frock, which showcased her curves to perfection.

The dress featured a sweeping train at the back which only served to heighten the glamour.

Height of glamour: Olivia looked gorgeous in the figure-hugging yellow gown, which featured an elegant train

Fits like a glove: The frock fit Olivia's hourglass figure to perfection

The star wore her glossy jet-black hair straight over her shoulders and tucked behind her ears with a side parting.

She kept her accessories to the bare minimum, opting for just a simple gold clutch and a gold bracelet.

Olivia highlighted her eyes with black eyeliner and sported a nude lip, while using a heavy hand with the blusher.

Your chariot awaits: A chauffeur opened Olivia's door for her as she made her way to the car, being careful not to trip over the long gown

Olivia was on her way to the Time 100 Gala, an event to celebrate the magazine's annual list of the 100 most influential people in the world.

This year's 350 expected guests include Jimmy Fallon, Daniel Day-Lewis and Lena Dunham.

Joe Biden, vice president of the United States, will make a speech and Christina Aguilera and Miguel are slated to perform. 

One her way: The actress sat regally in the backseat of the car, offering a glimpse of her gold heels