File this relationship under "Things that make you go hmmmm."

Despite their 15-year age difference, the romance between father of three Scott Disick and teen model Sofia Richie is staying strong.

Over the weekend, the pair, fresh from their whirlwind "taco night"-filled trip to Punta Mita, Mexico, grabbed a caffeine fix in Los Angeles on Saturday. The twosome were spotted holding hands during their quick trip.

In September, the pair were spotted kissing, canoodling and having a grand old party time together. From romantic dinners to kiss-filled outings on yachts and romantic strolls, the twosome seemed to be showing some major PDA everywhere they went.

Of course, this unlikely union between Kourtney Kardashian's 34-year-old ex and Lionel Richie's 19-year-old model daughter has some shaking their heads and others wanting to know more about the duo.

One of those people shaking their heads seems to be Sofia's famous father. "I am scared to death. Are you kidding me?" Lionel told Us Weekly

Like it or not, it's happening. Take a look at their romance in photos...

Scott Disick, Sofia Richie

Alexander Tamargo/Getty Images for Sugar Factory

The two stare into each other's eyes Art Week Party at Sugar Factory American Brasserie in Miami.

Scott Disick, Sofia Richie

Alexander Tamargo/Getty Images for Sugar Factory

The two share a kiss at the Art Week Party at Sugar Factory American Brasserie in Miami.

Scott Disick, Sofia Richie

Alexander Tamargo/Getty Images for Sugar Factory

The two enter the Art Week Party at Sugar Factory American Brasserie in Miami.

Scott Disick, Sofia Richie

Splash News

The two kiss passionately inside the DJ booth at the LIV nightclub.

Scott Disick, Sofia Richie

Romain Maurice/Getty Images for Haute Living

The two appear cozy at Haute Living, Art Life and the Maddox Gallery London's VIP cocktail party and presentation of the artworks of street artist Alec Monopoly and photographer David Yarrow during Art Basel Week in Miami.

Scott Disick, Sofia Richie

OHPIX / BACKGRID

The two lounge in the sun on Miami Beach.

Scott Disick, Sofia Richie

VEM / BACKGRID

The two hit Miami Beach with friends during Art Basel Week.

Scott Disick, Sofia Richie

Andrew Toth/Getty Images for Dujour

The lovebirds head to Miami to attend the DuJour Art Basel Kickoff party held at the Confidante Hotel in Miami Beach. 

Sofia Richie, Scott Disick

Splash News

The lovebirds share a sweet smooch in Venice.

Sofia Richie, Scott Disick

Splash News

The two walk close together during their Italian getaway.

Sofia Richie, Scott Disick

Ciao Pix/BACKGRID

The two wave on a gondola in Venice, Italy.

Sofia Richie, Scott Disick, Milan

Instagram

The lovebirds show some PDA in Milan on Oct. 15, 2017.

Sofia Richie, Scott Disick

TheImageDirect.com

The two are spotted holding hands at LAX on Oct. 14, 2017.

Scott Disick, Sofia Richie

BACKGRID

Scott and Sofia grabbed some drinks at a coffee shop in Los Angeles on Oct. 8, 2017.

Scott Disick, Sofia Richie, Mexico, Instagram

Instagram Story

The lovebirds were all over each other when they snuggled up together in Mexico.

Scott Disick, Sofia Richie

Instagram

The pair went to Punta Mita, Mexico and packed on the PDA on Oct. 3, 2017.

Sofia Richie, Scott Disick, Mexico

Clasos.com.mx / Splash News

The pair had a very steamy smooch on their romantic getaway in Puerto Vallarta, Mexico.

Scott Disick, Sofia Richie, Miami

Pichichipixx.com / Splash News

Scott and Sofia were enjoying their holiday in Miami on Sept. 23, 2017. The 34-year-old reality star and the 19-year-old model were spotted walking along the sand at the beach.

Scott Disick, Sofia Richie

DAME / BACKGRID

The two partied on the SS Groot together in Miami.

Scott Disick, Sofia Richie

DAME / BACKGRID

Kourtney Kardashian's ex was pictured passionately kissing his new girlfriend while they enjoyed an afternoon boat ride in Miami Beach on Sept. 23, 2017.

Scott Disick, Sofia Richie

VEM / BACKGRID

The pair held hands in Miami as they continued their vacation together.

Scott Disick, Sofia Richie

Snapchat

Following the family style dinner at Seaspice, in which they ordered meli melo, truffle pizza, king crab Legs, and octopus, the couple were surprised with a congratulatory cake with the inscription "Congratulations Scott & Sophia."

Scott Disick, Sofia Richie

Snapchat

A source tells E! News that while out to dinner at Seaspice in Miami, they ordered champagne and Barceló rum cocktails for the table and that Scott "held and kissed his new love through out the evening."

Scott Disick, Sofia Richie

Instagram

Sofia posted this pic from Miami with her legs draped over Scott's.

Scott Disick, Sofia Richie

Instagram

The two showed they world they were a couple when Scott shared this PDA-filled social media post.

Sofia Richie, Scott Disick

BG002/Bauer-Griffin/GC Images

Sparking rumors, Scott and Sofia were spotted on Sept. 15, 2017 in Los Angeles.

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