This can be either a woman walking in naked on a room full of people, being walked in on by others in the nude or when there top gets pulled off and they try to cover themselves. Preferably movies though when they try to cover themselves but something prevents them from doing so. Being tied down, having to run away ect.

Heres one
Underground Aces 1981 a womans dress gets ripped off and guys flock to surround her great body.

Sally Kellerman in M*A*S*H.

Cheryl Rixon in Used Cars.

Various women in Revenge of the Nerds.

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I love breasts. I love 'em! Boobs, bazooms, balloons, bags, bazongas. The bigger, the better. Nipples like udders, nipples like saucers, big pale rosy-brown nipples. Little bitty baby nipples. Real or fake, what's the difference? Tits are great!

Leslie Huntly in Back to School.

Moira Kelly in Chaplin.

Mariska Hargitay in Welcome to 18.

Rita George in Hollywood Boulevard.

Tara Fitzgerald in a dream sequence in Sirens.

Various girls in Zapped!

Various women in a shower in Police Academy. (I don't remember whether you get to see anything, but a male character gets an eyeful, and the women scream when they discover this.)

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I love breasts. I love 'em! Boobs, bazooms, balloons, bags, bazongas. The bigger, the better. Nipples like udders, nipples like saucers, big pale rosy-brown nipples. Little bitty baby nipples. Real or fake, what's the difference? Tits are great!

JoBeth Williams in Kramer vs. Kramer.

Charlotte Ross in an episode of N.Y.P.D. Blue.

Tara Reid in Cruel Intentions. (We don’t get to see anything.)

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I love breasts. I love 'em! Boobs, bazooms, balloons, bags, bazongas. The bigger, the better. Nipples like udders, nipples like saucers, big pale rosy-brown nipples. Little bitty baby nipples. Real or fake, what's the difference? Tits are great!

Monique Gabrielle in Emmanuelle 5 (1986) gets surrounded by a crowd of fans at Cannes who start tearing at her clothes. She ends up running topless to a marina and hopping onto a boat just as a guy grabs at her panties. She suffered some actual injuries (and real scares) filming this scene.

Elisha Cuthbert in The Girl Next Door. (We don't see anything. And she still used a body double.)

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I love breasts. I love 'em! Boobs, bazooms, balloons, bags, bazongas. The bigger, the better. Nipples like udders, nipples like saucers, big pale rosy-brown nipples. Little bitty baby nipples. Real or fake, what's the difference? Tits are great!

Various girls in Malibu Bikini Shop. They are racing along the beach, in the shallow water, when the water soluble threads in their bikinis dissolve from the splashing, and their bikinis fall off. They try to cover themselves with their hands, and keep running.

In China Beach, I think it was the premiere episode, a woman (may have been Dana Delany) is showering in an outdoor shower, and becomes very upset when some guys spy on her from a low-flying helicopter. Since this was broadcast TV, we don't see anything.

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I love breasts. I love 'em! Boobs, bazooms, balloons, bags, bazongas. The bigger, the better. Nipples like udders, nipples like saucers, big pale rosy-brown nipples. Little bitty baby nipples. Real or fake, what's the difference? Tits are great!

Not a celebrity, and not from a movie, but just for the fun of it:

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I love breasts. I love 'em! Boobs, bazooms, balloons, bags, bazongas. The bigger, the better. Nipples like udders, nipples like saucers, big pale rosy-brown nipples. Little bitty baby nipples. Real or fake, what's the difference? Tits are great!

I don't remember the scene perfectly, so I may be mistaken, but it seems that the scene with Virginia Madsen in Class would fit the description.

Kelly Preston in 52 Pick-Up

It sounds like this board applies a bit http://www.cndb.com/phpBB2/viewtopic.php?t=3548

Molly Shaade in Eurotrip (unrated cut).

She is sitting topless in a hot tub, when a guy she doesn't like shows up and jumps in the hot tub. She covers her breasts and yells at him. He then tricks her into forgetting to cover her breasts. Then some of her friends come along and express shock, and she suddenly realizes she's topless in front of this guy (and was about to let him touch her breasts), and she again becomes upset, covers her breasts, and yells at the guy. You can download the scene from here: http://www.mediafire.com/download.php?pkbh3dpt6fm

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I love breasts. I love 'em! Boobs, bazooms, balloons, bags, bazongas. The bigger, the better. Nipples like udders, nipples like saucers, big pale rosy-brown nipples. Little bitty baby nipples. Real or fake, what's the difference? Tits are great!

"Used Cars" has a great scene of very public exposure. Kurt Russell and his friends are illegally broadcasting a live ad for his used car business during a nationwide football game telecast, which goes awry when a model (Cheryl Rixon) gets her dress stuck on a car's hood ornament. Watching the ad collapse into turmoil, Russell decides to turn the situation to his advantage: he disguises is own face with salesman goggles, then steps on camera to put his unsuspecting model on less anonymous display. After a brief preamble, he cockily suggests, “Let's take a look under the hood, shall we?”, and proceeds to pop the hood of the car open, instantly stripping Rixon of her dress. She's left stark naked save for her heels and a skimpy G-string, quivering and squealing on live television for all to see. The ad appears to be broadcast to the football stadium as well, since her exposure is immediately met with uproarious cheers in addition to the laughter of the advertising film crew (and the shock or amusement of viewers at home). The delighted cameramen zoom in for detailed closeups, capturing all her charms for the audience's pleasure--and her efforts to cover herself only add to the amusement as she squirms against the car to hide her breasts, thus exposing herself to the camera even more intimately from behind! A grinning Russell then closes his ad just before the broadcast is stopped, making one last pitch for the business as Rixon's breasts jiggle beside him in the camera frame and a cameraman helps himself to a feel. Russell's ad—and Rixon's very public unveiling—is complete!