Credit: Arie Luyendyk, Jr. on Instagram

Arie Luyendyk, Jr. might be single and ready to mingle now that his relationship with The Bachelor's Courtney Robertson is over, but nowadays he's focusing on friendship. Although his friends happen to be sexy blonde bombshells, natch!

Arie recently celebrated his bestie Kristina Owen's birthday with a day of outdoor fun, including repelling (we know, fear) and hiking up Squaw Peak in Arie's hometown of Phoenix, Arizona!

Credit: Arie Luyendyk, Jr. on Instagram

Kristina and Arie have been BFFS since they met sophomore year of high school, and they've been joint at the hip ever since — but if you're wondering whether Kristina might be girlfriend material, think again. These two are just friends! 

"It’s never been like that with us," Kristina tells Wetpaint Entertainment. "From the start, we were just good, good friends. Now, we have more of a brother-sister relationship....He’s very honest and he’s always there for me."

Credit: Arie Luyendyk, Jr. on Instagram

Clearly, Arie and Kristina are super close. Just look at them repel together! So sporty and adorable.

Source: Instagram / Instagram