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Sarah Killen, left, and fiancé John Slowik Jr., at their home in Conway Township, Mich. on Wednesday. Conan O’Brien chose last week to pick Killen as the only person he would follow on Twitter. (Al Goldis/Associated Press)

Last week, Sarah Killen had three Twitter followers. This week, she has 20,000 — as well as a new iMac computer and offers to help pay for a dress and drinks for her wedding.

The unsuspecting rural Michigan woman has one out-of-work late-night talk show host to thank for her newfound online popularity — Conan O’Brien.

O’Brien chose last week to pick Killen as the only person he would follow on Twitter, turning the 19-year-ancient’s life upside down.

The deposed Tonight Show star whose exit deal with NBC barred him from TV appearances for several months, has taken to Twitter to reach the masses during his exile and has amassed more than a half-million followers.

Up until Friday, O’Brien had steadily increased his number of Twitter devotees without following the feeds of anyone else.

Enter Killen, who is finishing up her high school requirements, preparing to make the jump to college and marriage in September.

“I’ve chose to follow someone at random,” O’Brien’s posting on Friday read. “She likes peanut butter and gummy dinosaurs. Sarah Killen, your life is about to change.”

Boy, did it ever.

Immediately after O’Brien started following her, Killen — whose Twitter handle is “LovelyButton” — picked up followers at a rate of 150 per minute.

Then came the calls: Family, friends (actual and long-lost) and interview requests from websites, TV shows and radio stations.

She sleeps a few hours each night, has fallen woefully behind on her schoolwork and day-to-day activities such as laundry and rarely leaves the house.

“It’s really nuts,” she said.

Until O’Brien plucked Killen from obscurity and turned her into an overnight web celeb, she and fiancé John Slowik Jr. lived a normal life, residing in the basement of a house in Conway Township, more than an hour’s drive west from Detroit.

It’s hard to say exactly what O’Brien’s motivation was — O’Brien spokesman Beau Benton had no comment on Wednesday — but it’s had a profound effect on Killen and her 21-year-ancient fiance.

Gifts pour in

The exposure has resulted in a brand-new iMac, which was bought for them by a Florida businessman. A New York designer is donating a wedding dress, and someone else is sending wine for the nuptials.

Not terrible for a couple who saved $30 for the wedding, hadn’t reserved a location and faced the prospect of not being able to afford a wedding dress.

“People are saying that I’m asking for gifts and stuff, and I’m not,” Killen said.

What she is asking of her newfound army of Twitter followers is to contribute to charity, including the Susan G. Komen Race for the Cure.

Still, Slowik says he’d like one more thing from the man who used to make them laugh nightly during his abbreviated Tonight Show run: Slowik wants O’Brien to be his best man at the wedding.

Will he do it?

“I would hope so,” Killen said.