The 22-year-old, who is currently dating Silver Linings Playbook actor Bradley Cooper, has recently finished her first film, which is due out in October.
"I always did lots of theatre when I was at school," said Suki. "But you just wait for the right things, I want to do really cool stuff."
"I just finished my first film. It's called Love, Rosie and I play a girl called Bethany," she added. "It's got Lily Collins and Sam Claflin in, it's a love story following high school children into adult life. It was shot in Ireland. It's awesome."
"In Love, Rosie, I'm the one who gets in-between Lily Collins and Sam – a kind of poison dart in the love story," she said. "It was an incredible experience," she added. "(Sam's) absolutely hilarious – so comfortable in himself. The bits with him were the easiest to play, for sure."
British-born Suki, whose father Norman is a plastic surgeon, dropped out of school at the age of 16 to work as a model, after being discovered in a London pub.
It was her modelling career that led her to Bradley, who first won her over at the Elle Style Awards in 2013.
"We were introduced and hit it off almost immediately," recounts Suki, who has previously dated Kooks frontman Luke Pritchard and singer Miles Kane. "We were dancing at the after-party, and he asked me if I fancied going to a club."
"He's a ridiculously good dancer," she added. "But I'm a serious dancer too. We make a pretty good duo."
Suki, whose sister Imogen Waterhouse is also a model, has been dating Bradley since February 2013 and recently accompanied him for a White House state dinner, where they dined alongside President Barack Obama and First Lady Michelle Obama.
The pair were most recently spotted together staying at a hotel in New York.