Kourtney Kardashian has sent her fans wild with a bikini snap on Instagram? (Image: Kourtney Kardashian/Instagram)

Kourtney Kardashian has sent her fans wild with a bikini snap on Instagram but it isn't her sizzling pic that has whipped them up into a frenzy.

The photo from a holiday in Mexico has fuelled the belief that she is expecting her fourth child, despite the pic being a throwback from the summer.

Kourtney is seen posing with her children while on the family getaway to Cabo San Lucas as she wears a tiny pink bikini.

Her posture seems to accentuate her usually toned stomach, giving the appearance that she may be in the early stages of pregnancy.

The 41-year-old Keeping Up With The Kardashians star captioned the post: "Little Cabo daydream."

There was only one subject that dominated the comments and that was speculation about Kourtney being with child.

One fan exclaimed in the comments: "Does anyone else see a baby bump or am I crazy?"

 The comments were filled with speculation about Kourtney being with child (Image: Kourtney Kardashian/Instagram)

Another excitedly asked: "Wait so she’s preggo????????"

A third simply added: "Babie 4."

While fans "hoped" that Kourtney was pregnant, it has been reported that this might be far from the mark.

The photos are thought to be a throwback to the summer and recent photos of the reality star do not show her heavy with a baby bump.

In fact, eagle-eyed fans have pointed to pics from the Kardashian's Christmas Eve party, in which Kourtney is seen drinking from a cocktail glass.

It was then counter-argued that there is no proof that it was alcoholic and may have been a fruit 'mocktail'.

One fan asked Kourtney outright: "You’re pregnant. Right?"

Kourtney has yet to respond this time but has ruled out being pregnant previously during the lockdown, after it was levelled at her before.