Rob Pattinson wants Kristen Stewart to do the write thing.

For Kristen's 23rd birthday  which the Twilight couple spent this week with friends in L.A.  Rob bought Kristen a limited-edition Bentley fountain pen, according to Hollywood Life.

The price tag for the writing utensil? A cool $40,000.

That's right: He bought a pen for $40K. And we know what you're thinking to yourself right now: "A pen for $40,000? What's the catch?"

But apparently, the pen was right up Kristen's alley.

“Kristen has always collected pens, and has a variety of stylish ones,” says a source. “Rob decided to go big for her birthday this year and bought her a limited edition white gold Tibaldi Bentley Crewe fountain pen."

He even went the extra mile and had it personalized.

"He had her name specially engraved on it, with the year and wording: 'From R,'" the source adds. This sounds like the most sentimental pen ever.

Not to be overlooked in all of this: The mere fact that Kristen collects pens? You learn something new every day!

What's so special about this particular pen? Well, for starters, there are only 40 pens like it in the world.

“The pens have a two-tone 18-carat yellow gold nib covered in rhodium and ruthenium,” explains a source. “The barrel is identical to Bentley’s dashboard used in their earliest car.”

Okay, we suppose that makes it a little bit better. But we're just happy that Kristen is happy.

Now, is a pen something that we would spend $40,000 on? Uh, let's just coyly say that for the people who would like that sort of thing, that's just the sort of thing that they would like. 

Source: Hollywood Life