For A-listers and average Joes alike, the accomplishment of buying or selling a home often marks a major personal and financial milestone.

From upgrades to downgrades, tough sales to bitter feuds, these were some of the wildest celebrity real estate sales of 2018. After all, all's fair in love and bidding wars.

1. Matt Lauer slashes asking price of Hamptons estate by $2 million

Former "Today" show host Matt Lauer lowered the asking price for his Hamptons estate by $2.15 million, nine months after listing the property for $14.9 million, and four months after sexual assault allegations led NBC to can him from his high-paying gig.

As of mid-December, the home is still up for sale, according to its official listing page; the price has been cut again to $12.75 million.

2. Harvey Weinstein unloads Manhattan townhouse for $25.6 million

Disgraced movie mogul Harvey Weinstein sold the four-story, 5,000-square-foot building to an unknown buyer.

Disgraced movie mogul Harvey Weinstein sold the four-story, 5,000-square-foot building to an unknown buyer. (Reuters/Google Street View)

The same month, disgraced Hollywood film producer Harvey Weinstein sold his four-story, 5,000-square-foot property in Manhattan’s West Village to an unknown buyer for $25.6 million “amid mounting legal costs." He had originally purchased the building in 2006 for just $14.95 million

CRAZIEST HOMES THAT HIT THE MARKET IN 2018

3. Beach house formerly owned by Bernie Madoff hits market for $21 million

The current owners of Bernie Madoff's former beach house gave the place a "gut renovation" before putting it on the market.

The current owners of Bernie Madoff's former beach house gave the place a "gut renovation" before putting it on the market. (Reuters/Google Maps)

The gorgeous oceanfront home once owned by convicted Ponzi-schemer Bernie Madoff hit the market for a cool $21 million in April. The house, located on the end of Long Island in Montauk, N.Y., was originally seized by the feds in 2008 following Madoff’s arrest, along with other vacation properties and assets. The U.S. Marshals Service later sold off the three-bedroom beach house for $9.41 million in 2009, using the money to pay back Madoff’s victims. According to the property's Zillow listing, the house is still currently for sale.

4. Prince's Turks and Caicos estate, and its purple driveway, go up for auction

The five-acre property was formerly on the market for $12 million, but never sold.

The five-acre property was formerly on the market for $12 million, but never sold. (The Prince Estate/Reuters)

The five-acre Caribbean island estate (complete with purple driveway) belonging to the late musician Prince hit the auction block in July. The identity of the highest bidder and new owner remains unclear.

5. Iconic Bel Air mansion owned by Zsa Zsa Gabor up for sale

This classic 1950s Bel Air mansion is also rumored to have been occupied by Howard Hughes and Elvis Presley. 

This classic 1950s Bel Air mansion is also rumored to have been occupied by Howard Hughes and Elvis Presley.  (Adam Latham)

The same month, a storied Bel Air mansion once owned by socialite and actress Zsa Zsa Gabor went up for sale, the asking price being a cool $23.4 million. The home was rumored to have been occupied by playboy and aviator Howard Hughes, and even the King of Rock 'n' Roll Elvis Presley. In September, the LA Times reported that the mansion was sold for $20.8 million, or $2.6 million below the initial listing price.

6. New York City's richest couple buy $40 million mansion in cash

The 15,000-square-foot home was originally listed for $51 million.

The 15,000-square-foot home was originally listed for $51 million. (Google)

Wealthy David and Julia Koch bought an Upper East Side mansion ─ reportedly on a whim, according to The New York Post ─ in late August for $40 million in cash. The stately East 76th St. home clocks in at a sprawling 15,000 square feet.

“They just fell in love with it and felt like they had to have it,” a source for the Post said.

David and Julia Koch reportedly paid cash for a $40.25 million NYC mansion.

David and Julia Koch reportedly paid cash for a $40.25 million NYC mansion. (AP)

7. Price slashed on 'Wolf of Wall Street's' house 

The 2-acre spread, at 5 Pin Oak Court in Glen Head, is available for $2.89 million.

The 2-acre spread, at 5 Pin Oak Court in Glen Head, is available for $2.89 million. (Kevin Wohler)

The real-life Long Island home of Jordan Belfort, whose rise and fall inspired the hit flick “The Wolf of Wall Street," returned to the market in August for a cool $2.89 million following a price chop and a broker swap. According to Zillow, the home has since been sold.

FOLLOW US ON FACEBOOK FOR MORE FOX LIFESTYLE NEWS

8. 'Brady Bunch' house sniped by HGTV in bidding war 

Lance Bass revealed a corporate buyer for HGTV ruined his chance to purchase the iconic "Brady Bunch" house.

The former *NSYNC member thought “It’s Gonna Be Me” when he came out on top in the bidding war for the home in Los Angeles' Studio City neighborhood, but that quickly turned into “Bye Bye Bye," and HGTV came forward as the winning bidder in August.

The “Brady Bunch” home attracts 30 to 50 visitors on a daily basis, and it even has its own Yelp page with a 4-1/2 star rating.

9. Hamptons estate linked to JFK's sister selling for $35 million

The estate is actually two separate parcels at 363 and 351 Sagaponack Road in Bridgehampton

The estate is actually two separate parcels at 363 and 351 Sagaponack Road in Bridgehampton (Google)

In September, a Hamptons estate owned by a trust linked to 90-year-old Jean Kennedy Smith, the longest surviving sibling of the late president John F. Kennedy, hit the market for a hefty $35 million. As of press time, the Corcoran listing was still available for sale at its original price tag.

One of the homes on the estate was owned by a trust associated with Jean Kennedy Smith, seen here at the East Hampton Library in 2017.

One of the homes on the estate was owned by a trust associated with Jean Kennedy Smith, seen here at the East Hampton Library in 2017. (Sonia Moskowitz/Wire Image via Getty Images)

10. Elvis Presley's Palm Springs honeymoon home can't find a buyer

The Palm Springs home has returned to the market.

The Palm Springs home has returned to the market. (Realtor.com)

Meanwhile, the Palm Springs honeymoon home of "The King" just can't seem to find a buyer. The 5,000-square-foot house has gone on and off the market since 2014 — and is up for sale again, to the tune of $2.695 million.

Elvis Presley and Priscilla Beaulieu Presley on their wedding day, May 1st, 1967, in Las Vegas. (Photo by Hulton Archive/Getty Images)

Elvis Presley and Priscilla Beaulieu Presley on their wedding day, May 1st, 1967, in Las Vegas. (Photo by Hulton Archive/Getty Images)

Fox News’ Alexandra Deabler, Michael Bartiromo, Katherine Lam, Ryan Gaydos, Caroline Judelson and Jack Wisniewski contributed to this report.