Rocker RICHIE SAMBORA has been caught in a cheating scandal – after two-timing ex-wife Heather Locklear and on-again, off-again sweetie Denise Richards!

In a bombshell exclusive interview with The National ENQUIRER, a gorgeous blonde business associate of the former Bon Jovi guitarist claims they’ve been carrying on a longtime affair.

Los Angeles–based Nikki Lund – who founded the “Nikki Rich” fashion line with Richie – said: “It’s been going on for eight years. We never went public with it out of respect for his family … [and] “We also work together. We decided to keep it secret because we wanted people to take our business seriously.” 

They first hooked up in 2006 when Richie’s marriage to Heather – star of “Dynasty,” “Spin City” and “Melrose Place” – was crumbling, and the two were battling for custody of their now 17-year-old daughter Ava, said Nikki.

At the time, Nikki was an up-and-coming designer, and Richie persuaded a rep to call her to talk fashion.

“The chemistry was there, but I was in a relationship and so was he,” Nikki, 32, told The ENQUIRER.

“But it was probably inevitable that things would happen because of that chemistry. [My relationship with him] may have overlapped with others.”

A casualty of their affair was not only Heather, but also Heather’s best pal 
Denise, who dated Richie on and off between 2006 and 2012.

Nikki recently hinted at her romance with Richie while doing publicity for their fashion line.

After a giant billboard on Hollywood’s Sunset Strip was unveiled, the two were spotted sneaking into the nearby Chateau Marmont hotel.

Later, confronted by Playboy TV, Nikki blurted out: “Richie is great in bed.”

Nikki told The ENQUIRER: “Playboy TV put me on the spot. Richie and I were texting, so I asked him what I should say. He said, ‘Just tell them I’m good in bed.’ So I did.”

The disclosures have stung Richie’s latest squeeze, blonde beauty Orianthi Panagaris.

“Orianthi is jealous. But the fact is, Nikki has known Richie since he was married to Heather. She’s the one constant in his life,” a source told The ENQUIRER.

Nikki added: “Whatever happens between Richie and me, our fashion business comes first.”