Alexis Neiers Arrested -- Black Tar Heroin Found

Alexis Neiers -- star of the E! reality show "Pretty Wild" -- was just arrested for a probation violation ... and law enforcement sources tell TMZ, she was in possession of black tar heroin when they found her.

We're told Neiers never checked in for probation after being released from jail in July ... so this morning, cops decided to pay her a visit at her L.A. home.

Law enforcement sources tell us cops searched the place, discovered black tar heroin ... and immediately placed Neiers under arrest.

Neiers is still on probation for burglarizing Orlando Bloom's L.A. home last year -- so this new arrest could lead to some serious time behind bars.

Calls to Neiers' reps have not been returned.

Credit: TMZ

Spencer Pratt -- I Was Arrested in Costa Rica

We're not vouching for Spencer Pratt, but his people tell TMZ Spencer was busted at an airport in Costa Rica for illegal possession of a firearm.

As the story goes ... Spencer was on his way out of the country when he was busted for felony possession. We're told he was booked and processed at a local jail and later released after turning over the weapons and signing a confession with the DA. Yes, we're skeptical, too.

So far, we haven't been able to confirm any of this. But we do have this bizarre statement from Spencer himself:

"As part of my spiritual cleansing I've spent the last week living alone in the jungle, reflecting on my past transgressions, and working to become a better person. I had to live off the land, and hunt to survive. As I departed the country this morning to continue my spiritual journey, I mistakenly brought my hunting weapons to the airport. It was an honest mistake, and they sent me on my way. On an unrelated note, I'm not allowed in the country anymore -- but that's because of the chicken incident."

UPDATE: As it turns out, Spencer Pratt was in fact arrested in Costa Rica yesterday. He was cited and released.

We've gotten our look at an arresting document from Costa Rica -- and even though it's in Spanish, it does have his name on it and includes words like "guilty," "charged" and "prosecution."

Heidi's name is in there to, listed as his spouse.

Credit: TMZ