Tekashi drops $100K on birthday gift for girlfriend

Tekashi 6ix9ine may be in jail - but he's still buying gifts for his bae. And he's spending big MONEY on her.

Yesterday was his girlfriend Jade's birthday - and the rapper made sure to get her a gift. 

Jade told instagram that Tekashi bought her a diamond Rolex watch and gave her a stack of money. And she showed her gifts on social media. Word is that the Rolex costs about $100K.

We're pretty sure that the feds are watching her Instagram, it's not clear whether she could be in trouble now.

Tekashi is currently under federal indictment for allegedly violating the RICO organized crime statute.

According to TMZ, sources close to the rapper told them that Tekashi picked out the piece several weeks ago, and customized it with 18k white and rose gold and 24 carats worth of VS diamonds. In total, we're told it set Tekashi back around $35,000 -- a drop in the bucket, especially considering how "Dummy Boy" has blown up since then.

Here are pics of Jade stunting on the Gram with her gifts:

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6ix9ine was arrested by federal agents on gun, drug and racketeering charges. He remains in custody and his lawyer's still working on getting him out on bail. His trial isn't scheduled to start until September.