Cop with gun poses as student with Emma Watson at graduation

'Harry Potter' actress Emma Watson, 24, graduated from Brown University on Sunday.

At a ceremony the British actress proudly stood with her fellow student to collect her diploma.

Undercover cop (L) poses as student with Emma Watson. (AP)

The “student” sitting next to her even joined her and her mom while leaving the ceremony. Must be good friends, right??

Wrong! The actress was flanked by an undercover police officer throughout the graduation ceremony.

An armed policewoman wore a traditional cap and gown to blend in with the other 2,000 graduates.

(AP)

According to photos published by The Daily Mail, the female police officer at first escorted Watson onto the university campus dressed in plainclothes, but would later change into a graduation cap and gown to appear more discreet.

The policewoman wore a pink shirt and blue jeans, and was carrying a gun, her badge and a walkie-talkie.

Watson was seated between the officer and her mother, Jacqueline Luesby, throughout the outdoor ceremony in Rhode Island.

Watson enrolled at Brown in 2008, completing a degree in English Literature — occasionally from abroad — over six years.

(AP)

The 24-year-old actress added some extra glamour to the traditional graduation attire by applying bright red lipstick before sharing a picture of her looking happy and relaxed on Twitter.

Emma previously praised her classmates for giving her an opportunity to experience life away from the spotlight.

She previously said: "I've never even been asked for an autograph on campus. I threw a party for nearly 100 students and not a single person put a photo on Facebook."

In an interview last year, the 'Noah' star said: "People told me it wasn't possible. I kept saying, 'I don't care.' This is what I want. And graduating will, for me, be really symbolic of all of that."

She added: "I will be there. And I will be throwing a huge party."

The British star also insisted she is still very ambitious.

She said: "I've got so much left to do and to prove."

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