Alyse Lahti Johnston's mugshot after Oct 2010 arrest for suspicion of DUI

*Not only are there reports that Tiger Woods has a new girlfriend, but the woman was arrested in October for suspicion of drunk driving and is only in the relationship for one thing … sex.

A sudden flurry of reports from sports blog Terez Owens and gossip site RadarOnline Sunday has the golfer dating 22-year-old blonde Alyse Lahti Johnston. The couple met “a few months ago,” according to the websites.

She grew up in Cleveland, Ohio — where IMG has one of its offices — and her biological father is former St. Louis Cardinals pitcher Jeff Lahti.  Her stepfather Alistair Johnston is a member of the board of IMG, the giant sports agency that reps Woods.  He and Alyse’s mother spend half the year at their estate in Windermere, Florida — the exclusive enclave where Woods also lives.  It was that address Alyse gave cops when they busted her for DUI.

She graduated from Ohio State, is now taking classes at Ohio-based Northwood University, which also has a campus in West Palm Beach, Florida. A source tells RadarOnline.com that she’s also training for the LPGA Tour.

“Her stepdad hired a coach for her,” a source told sports blogger Terez Owens.  “He introduced her to Tiger.”

RadarOnline.com says it spoke exclusively to one of Alyse’s friends and former classmates who claim the relationship is nothing serious – at least on her part.

“She sent a BBM to a mutual friend of ours saying she didn’t consider herself Tiger’s girlfriend. They were just having a good time hooking up,” the source tells RadarOnline.

That’s in keeping with Alyse’s personality, the source says. “She is a really nice girl, smart and super friendly.  And she’s also a bit of a wild child. She definitely likes to have fun.”

Alyse moved last year to the Windermere, Florida estate where her mother and stepfather had relocated. She’d taken a job with a fashion company in nearby Orlando, but hated it, the source says, and didn’t stay with the company for long.

“Alyse wouldn’t care about Tiger’s money,” the source says. “That’s never motivated her and she comes from a very well-to-do family anyway.

“She just wants to have a good time and lots of fun. I can definitely see her considering sex with Tiger a lot more fun than a relationship with him.”

Perhaps she was having too much fun on October 9, 2010 – when Orlando, Florida PD busted her for suspicion of DUI, RadarOnline.com is exclusively reporting.

When charges were actually brought against her on December 10, Orange County, FL court records show that Alyse — represented by a high profile Florida attorney — was only charged with Reckless Driving, a first degree misdemeanor.  Alyse pleaded no contest to the charge and adjudication was withheld pending her meeting several conditions.

She was ordered to complete a DUI Counter Attack School and a Victims Awareness Program.  She was also ordered to obtain a substance abuse evaluation, and report to probation.

The case went back to court on January 21, 2011, with the final charge being “Improper Change of Lane — Pulling in front of vehicle.”  That’s a simple traffic infraction, and the case was closed.