Evidence of a relationship has mounted as Ariana Grande and Big Sean have kept mum.

That was until they were caught kissing on the Revenge of the Mummy ride at Universal Studios Hollywood.

An anonymous source allegedly close to Big Sean told Radar Online, "They wanted to let everyone know that they are, in fact, together. He grounds her and is a really good and positive role model in her life."

In addition, Radar Online reported that Big Sean has the approval of Grande's mother.

Both Grande and Sean have been skirting the question at every interview, but have not been so careful in public -- having been caught on several occasions holding hands or kissing.

One of the first times they were caught holding hands was backstage at the MTV Video Music Awards, and soon after Grande shared a picture on Instagram that was allegedly their shadows together.

In radio interviews, both have spoken highly of each other and said the other is special or important, but have never confirmed they are dating.

In an interview with Ryan Seacrest in September, Big Sean said, "I like to keep my personal life personal. You know what I'm saying? But I am going to tell you this: That Ariana is very, very special," he continued. "She's very special to me. Everything she has going on is good with her, everything I have going on is good with me, everything between me and her is good, and I'm just going to leave it at that."

The two have collaborated on a few songs together, including "Right There" and "Best Mistake."

They have also been seen together at Grande's public appearances: including a recent event in New York after her "Saturday Night Live" debut.

The picture from the Universal ride was posted on Twitter and has been circulating around the web, with many reports using the image as confirmation of the relationship.