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...

Sofia Richie, Scott Disick

LRNYC / MEGA

Sofia Richie, Scott Disick, 21st birthday

Denise Truscello/Getty Images for Wynn Nightlife

Scott Disick, Sofia Richie, Kris Jenner

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Scott Disick, Sofia Richie

Cobra Team / BACKGRID

Scott Disick, Sofia Richie, yacht, Positano

Ciao Pix / BACKGRID

Scott Disick, Sofia Richie

Instagram

Scott Disick, Birthday Party, Sofia Richie

Instagram

Scott Disick, Birthday Party, Sofia Richie, Kylie Jenner, Kourtney Kardashian

Instagram

Scott Disick, Sophia Richie

Presley Ann/Getty Images

Scott Disick, Sofia Richie

Joe Scarnici/Getty Images for Theatre Box

Scott Disick, Sofia Richie, Las Vegas, Hotel Room

Instagram / Sofia Richie

Sofia Richie, Scott Disick

Denise Truscello/WireImage

Kourtney Kardashian, Sofia Richie, Scott Disick

Splash News

Sofia Richie, Scott Disick

Instagram

Scott Disick, Sofia Richie

Tommaso Boddi/Getty Images for Maddox Gallery

Scott Disick, Sofia Richie

Instagram

Scott Disick, Sofia Richie

Instagram

Scott Disick, Sofia Richie

Instagram

Scott Disick, Sofia Richie, Mason Disick, Mexico, Snapchat

Snapchat

Sofia Richie, Scott Disick

X17

Scott Disick, Sofia Richie

X17

Scott Disick, Sofia Richie, Mexico

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Scott Disick, Sofia Richie, Instagram, Mexico

Sofia Richie/Instagram

Scott Disick, Sofia Richie, Instagram, Mexico

Scott Disick/Instagram

Sofia Richie, Scott Disick, Mexico

Instagram

Sofia Richie, Scott Disick

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Scott Disick, Sofia Richie

Instagram

Sofia Richie, Scott Disick

Instagram

Scott Disick, Sofia Richie

Alexander Tamargo/Getty Images for Sugar Factory

Scott Disick, Sofia Richie

Alexander Tamargo/Getty Images for Sugar Factory

Scott Disick, Sofia Richie

Alexander Tamargo/Getty Images for Sugar Factory

Scott Disick, Sofia Richie

Splash News

Scott Disick, Sofia Richie

Romain Maurice/Getty Images for Haute Living

Scott Disick, Sofia Richie

OHPIX / BACKGRID

Scott Disick, Sofia Richie

VEM / BACKGRID

Scott Disick, Sofia Richie

Andrew Toth/Getty Images for Dujour

Sofia Richie, Scott Disick

Splash News

Sofia Richie, Scott Disick

Splash News

Sofia Richie, Scott Disick

Ciao Pix/BACKGRID

Sofia Richie, Scott Disick, Milan

Instagram

Sofia Richie, Scott Disick

TheImageDirect.com

Scott Disick, Sofia Richie

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Scott Disick, Sofia Richie, Mexico, Instagram

Instagram Story

Scott Disick, Sofia Richie

Instagram

Sofia Richie, Scott Disick, Mexico

Clasos.com.mx / Splash News

Scott Disick, Sofia Richie, Miami

Pichichipixx.com / Splash News

Scott Disick, Sofia Richie

DAME / BACKGRID

Scott Disick, Sofia Richie

DAME / BACKGRID

Photos

See More From Scott Disick & Sofia Richie: Romance Rewind

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