A 26 year old girlfriend & a new $5 mil+ penthouse? It's been a good week for Nick Jonas

A Kahi Lee designed penthouse at The Residences @ W Hollywood.

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The youngest of the singing Jonas Brothers, 18-year-old Nick Jonas, just bought himself a $5 million-plus penthouse in Hollywood, Calif., and had it nicely furnished by a star of HGTV's Design On a Dime.

He liked everything hot designer Kahi Lee put into the crib at The Residences at the W Hollywood -- except for two photos on the wall.

"The only pieces he asked me to take down were the portraits of Jane Fonda and Jim Morrison," Lee wrote on her Facebook page. "And I'm pretty sure it's because he doesn't know who they are. He was born in 1992 after all."

Hard to believe Jonas wouldn't know the deceased former frontman of The Doors or the sexy star of Barbarella!

But at least, according to Lee, the teenage ex-boyfriend of actress/singer Miley Cyrus has impeccable taste.

A 26 year old girlfriend & finally moving out of his parents place to a penthouse? It's been a good week for Nick Jonas I'd say.

Also, I'd like to give this kid more credit than the article and presume that he does know who Jim Morrison is...