The actor splashed out on a limited edition Bentley pen for his girlfriend to add to her collection and even had it engraved to commemorate her turning 23 on April 9, reported Daily Star.
"Kristen has always collected pens, and has a variety of stylish ones. Rob decided to go big for her birthday this year and brought her a limited edition white gold Tibaldi Bentley Crewe fountain pen. He had her name specially engraved on it with the year and wording, 'From R'. There are only 40 of these pens in the world, so it's a real collector's item," a source said.
"The pens have a two-tone 18-carat yellow gold nib covered in rhodium and ruthenium. The barrel is identical to Bentley's dashboard used in their earliest car.