Besides no secret being safe and the letter A being not all that it's cracked up to be, there's a lot we've learnt from Pretty Little Liars – the old bell tower is a great place to dump a dead body, girls fight much dirtier than boys, and the party don't start 'til Jenna walks in...

Anyway, what with us having to bid farewell to Rosewood for good in April 2017, there's no better time than now to focus on the latest fan theory about Alison DiLaurentis.

Are you ready? This conspiracy will blow your pretty little mind.

Fans have always wondered why Alison faked her own death, speculating that she actually needed to get out of town (for nine months or two years) because she was pregnant and didn't want anyone to know about it.

Remember in a flashback when she said "If [the father] finds out, he's gonna kill me"?

But the speculation that Alison was pregnant when she fake-died turned out to be a red herring, with Mona eventually revealing to Spencer that Ali's pregnancy was a false alarm.

But forget everything you've heard because this new fan theory suggests that Ali may have had a baby back in 2013 after all. And not only that, but that the father could be Detective Darren Wilden. Dun dun duuun.

According to one eagle-eyed Instagram user, longlivekingwilden, Ali was so desperate to know who "A" was because they knew her secret.

Let's break it down – adding in the two years of her disappearance, the time she was back in Rosewood, and the time jump, Ali's baby would be about seven or eight now. Right?

Now, cast your mind back to that weird Amish girl, you know, the one who loved playing with her dolls and her favourite was Alison. Well, she looked about seven or eight – so it's totally plausible that she could be Ali's secret daughter.

AND according to WetPaint, the girl's name, Eliza, could be linked to Audrey Hepburn's character's name from My Fair Lady. Which would make sense, because Ali is a vocal Audrey lover in the show, with Ezra previously calling her his Holly Golightly.

Now for the father – back in season 3, when the DiLaurentis family were holidaying in Cape May, Alison told CeCe Drake that she was "late" on her period and in a notebook conversation with herself, Ali wrote that she was afraid of "Beach Hottie's" reaction to the news.

And we all know that Detective Wilden was in Cape May that same summer, so could he have been the "Beach Hottie"?

After all, though we once thought "Board Shorts"and "Beach Hottie" were the same guy, "Board Shorts" turned out to be Ezra and he didn't have a sexual relationship with Ali – so that just leaves Wilden.

If that's not enough for you, WetPaint continues to point out that in Sara Shepard's Pretty Little Liars book series, Wilden is Amish.

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The plot thickens.

Think back to when CeCe asked Wilden for money and he refused – was this for Ali's abortion? And is this why Charlotte ending up killing him?

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Let's not forget, Ali is now haunted by Wilden's ghost, so is this because he's the baby daddy? We actually cannot handle this.

It seems totally believable, right? After all, Alison DiLaurentis is the original liar so who says she hasn't lied about her pregnancy scare and giving birth too?

The summer finale, as you now know, saw Noel Khan beheaded, revealed Alison to be pregnant (AGAIN if you believe the above theory), and Mary Drake to be Spencer's biological mother.

But if you can't wait eight months to find out what happens next, watch the new trailer for the second part of the final season of Pretty Little Liars below, which hints at a number of developments, including Spencer's post-gunshot fate and the identity of A.D. FINALLY being revealed...

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The teen drama is officially coming to an end after its seventh run, following some hefty speculation over its future.