Jack Black‘s fully in the holiday spirit … rattling off a Christmas carol for us in his typical hard-rocking voice in New York City!

We caught up with the actor and singer outside “The Drew Barrymore Show” Thursday … and we asked him what his least favorite holiday tradition is.

Either Jack didn’t hear us, or he chose to stay positive and give us one of his favorites instead … because he launches into the song with his usual enthusiasm and projection.

”Teen Mom” alum Jenelle Evans is basically a brand-new woman — and we mean literally — after undergoing a full-blown mommy makeover, with her before-and-after pics showing a jaw-dropping transformation.

Check it out … just days before her 34th birthday, JE debuted her bangin’ new bod, and we’re breaking down everything she had done — starting with a full boob overhaul, swapping in some 400cc silicone implants.

Jenelle’s boob upgrade was paired with a full tummy tuck, repairing post-pregnancy abdominal muscle separation … and docs also removed a whopping 4.8 pounds of excess skin to give her a snatched, sculpted waistline.

Joran van der Sloot — the man who confessed to killing Natalee Holloway after her 2005 disappearance — reportedly tried to commit suicide in prison Saturday.

According to Peruvian news outlet La Republica … Joran — who is incarcerated at the maximum security Challapalca Prison — was found hanging from a strip of blanket in his cell while guards were distributing breakfast.

The 38-year-old Dutch national was reportedly taken to the infirmary, where he was nursed back to stable condition.

According to the outlet, officials said the manner in which guards found Joran “suggested a possible suicide attempt.”

In the U.S., Joran was charged with attempting to sell information to Natalee’s family about where her remains are … which basically equated to extortion.

He’s set to do a 20-year bid in the U.S. once he’s done his time in Peru.