Sofia Richie

It may be a new year, but Kourtney Kardashian is trying hard to maintain her old figure.

The mother of three simply can't afford to let herself go, not when she's 39 and Sofia Richie is 20 and Kourtney has to compete with her ex-boyfriend's lover on a near-daily basis.

So, ya got any big plans for New Year's Eve?

Well, as excited as you might be about the idea of popping a bottle of Spumante and enjoying a midnight toast with your parakeets, it seems the Kardashian-Jenner family has outdone you yet again.

While Scott Disick flaunting his relationship with Sofia Richie has caused some problems in the past, things with Kourtney Kardashian are okay these days.

Actually, it's better than okay, since he went with his girlfriend and ex to vacation in Cabo with their kids.

Against all odds, Scott Disick and Sofia Richie have been dating for over a year now.

While the age gap remains more than a little creepy (Scott is 35; Sofia is 20), most folks in the couple's inner circle have grown accustomed to the romance.

Sofia Richie can't even legally buy a drink in the US, and Scott Disick is old enough and alcoholic enough that he's already sucked up all the booze the rest of the world has to offer.

But despite their age difference, Sofia has apparently assumed the role of Scott's stepmom.

Last week, Kourtney Kardashian taunted Sofia Richie with a dramatically posed "co-parenting" pic featuring her ex, Scott Disick.

It's not difficult to imagine that Sofia taking that photo a little personally.

Last week, the world was baffled when Kourtney Kardashian had dinner with Scott Disick and Sofia Richie.

Now, Scott and Kourtney have maintained close ties due to the fact that they share three kids together -- but Sofia?

According to a new report, there's more to Sofia Richie's fear that Scott Disick will cheat.

She's apparently given him an ultimatum.

Even though Sofia Richie, Scott Disick, and Kourtney Kardashian met for what must have been a very awkward dinner last week, Sofia has lingering concerns.

Her much older boyfriend shares three kids and years of memories with Kourt.

Scott Disick had a threesome with Kourtney Kardashian and Sofia Richie on Sunday night.

But not in the way he has likely fantasized about for the past year or so.

While it's true that Scott Disick is still banging a very hot model, he may have spent a night or two on the couch.

The self-styled Lord and Sofia Richie had a very public fight. There were tears.

Even though Scott Disick is still banging a very young model, it's been a while since he bragged about Sofia Richie on Instagram.

According to a report, this has begun to hurt Sofia's feelings. 

Scott Disick has been sure to use social media to remind Kourtney and the world that he is still banging a very young model.

His relationship with now-20-year-old Sofia Richie has lasted longer than anyone expected -- him included.

Love triangles are always difficult, but the whole situation gets even more complicated when two of the participants are pushing 40, and the third isn't even old enough to drink.

That's the lesson Kourtney Kardashian and Scott Disick are learning the hard way these days, as Sofia Richie is apparently causing major problems for their co-parenting relationship.

You don't know what you've got until it's gone; the grass is always greener; the alcoholic baby daddy suddenly looks bangable again now that he's hooking up with a model who's half your age ...

We've all heard the cliches before.

Sofia Richie is finally no longer a teenager, but Scott Disick still wants the world to know that he's banging a very young model.

But banging can have some very natural consequences, and recently, the two reportedly experienced a pregnancy scare.

In case you haven't checked in on Scott Disick in a while, and you were hoping that his cradle-robbing relationship with Sofia Richie had quietly come to an end ... we have some bad news for you.

While Disick and Sofia did break up over the summer in a brief burst rationality, they've since resumed their ill-advised romance.

Back in June, Sofia Richie and Scott Disick broke up after roughly a year of dating.

The news didn't really shock anyone, as no one expected this couple to last.

It's been over a year since we first learned that Sofia Richie is dating Scott Disick.

It's one of those relationships that's tough to wrap your head around, and not just because of the massive age gap.

It's been an interesting week in the life of Kourtney Kardashian.

First, Kourtney feuded with Kim Kardashian after a bizarre Keeping Up With the Kardashians scene in which Kim insulted her appearance.

According to a new report, Scott Disick and Sofia Richie are living in sin.

How so?

There weren't many surprises on this year's Maxim Hot 100 list.

Kate Upton topped the list, and in the crowd of runners-up, there were many familiar faces, including Emily Ratajkowski, Demi Lovato, and a whole slew of Kardashians and Jenners.

When the world first learned that Scott Disick and Sofia Richie are dating, it was widely assumed that the relationship would last about as long as one of Scott's many rehab stints.

But one year later, in spite of frequent rumors that Scott and Sofia have broken up, the couple is still going strong.

Over the weekend, news broke that Scott Disick and Sofia Richie had broken up.

Fans feared that Scott would fall off the wagon. Reports claimed that Scott had done the unthinkable and cheated on Sofia.