Jake Paul might be the best brother of all time ... 'cause El Gallo hooked Logan up with an extravagant Christmas present this year -- an Audemars Piguet watch!!
The WWE Superstar shared the kind gesture on his Instagram page this week ... showing off what appears to be a Royal Oak Selfwinding Chronograph timepiece, which comes with an eye-popping, tens-of-thousands-of-dollar price tag.
The Paul Bros enjoyed their holiday on the lake with all their loved ones ... and the new mom and dad even took a second to do a cold plunge together -- with Logan and Nina wearing nothing but Santa hats and skivvies for the occasion.
Worth noting -- Logan referred to the S.I. Swimsuit model as his "wife," although as far as we know ... they're still engaged.
There were plenty of holiday shenanigans from Logan and Jake -- they also documented their time on the ice as they played some hockey and rode around on mini four-wheelers.
No word on what Logan ended up getting Jake in return ... but considering these guys have unlimited funds, we take it he found something thoughtful AND expensive.