Another day another washed up rapper (and his son) gets locked up!

Old school rapper Coolio was arrested in Las Vegas today … and sadly enough he’s currently behind bars at the same jail as the son, who played alongside him in his now defunct oxygen reality show Coolio Rules.

I guess the apple doesn’t fall far from the tree huh? *sigh*

Details + mugshots below:

According to TMZ, Coolio was a passenger in a Nissan Versa which was pulled over for a routine traffic violation early Friday morning.

We’re told the cops ran Coolio’s name in the system and noticed he had 2 active bench warrants out for his arrest stemming from multiple traffic violations.

Coolio was arrested and hauled to Clark County Detention Center — the same place where his son Grtis is rotting away for allegedly robbing some dude at gunpoint a few months ago.

Coolio’s bail has been set at $5,850. A court date has not yet been set.

[Sidebar: If nothing else, Coolio shoulda been cited by the fashion police for that monstrosity on his head! But I digress… ]

Coolio’s oldest son is also locked up in the same Nevada jail after he allegedly teamed up with a Vegas hooker to rob some dude at gunpoint.

22-year-old Grtis Ivey (who went by “Artis” on the reality show) … was arrested on November 14, 2011 for allegedly busting into a Vegas apartment with a gun and forcing the tenant into the bathroom … while he and a female prostitute named Shantrice Wilkerson ransacked the place.

According to the police report, Shantrice was trollin’ at LAX nightclub at the Luxor on October 26 and met a guy named Joseph Hall … who didn’t know she was a call girl.

The two hit it off … and Wilkerson told him that she had a “dream” of having sex on a pile of money.

Hall asked if $5,000 was OK …? she agreed … and the two eventually went back to Hall’s apartment to grab the cash out of a safe.

According to the report, the two bounced to Wilkerson’s pad to do the deed … but before it went down, Wilkerson asked for money … and Hall flipped out and left.

But cops say, Wilkerson REMEMBERED where Hall lived … and brought Grtis to the place 3 days later so they could rob it.

According to the report … Grtis entered the pad with a gun … and ordered Hall’s rooommate into the bathroom while he and the hooker stole a safe, 2 iPads, 2 laptops, passports, and anything else that wasn’t nailed down.

Cops say the roommate was able to identify Coolio’s son and the hooker — and both were arrested on a slew of charges including robbery with a deadly weapon, first degree kidnapping and grand larceny.

Both Grtis and Wilkerson told cops they never brought a gun to the apartment … and Wilkerson admitted to stealing some of the stuff.

Grtis is being held without bail … and is due to face a judge on Monday.

Maaannnnn? it’s way too much going on! But I guess they’ve both been spending most their lives living in a “Gangsta’s Paradise”…. *sigh*

VIDEO: GANSTERS PARADISE – COOLIO

**Update: 3/9/12 ** Coolio posted bond and was spotted at a Vegas Casino an hour later where he posed for the following pic:

I have no words for what’s on top of his head… 😕

FULL PHOTO GALLERY