Katy Perry and Orlando Bloom really hit it off at a Golden Globes afterparty earlier this year and have been spending a lot of time with each other since. While neither of them have confirmed that they're official, it became obvious that this was more than just a flirty fling when Perry was seen spending time with Bloom's 5-year-old son Flynn last month.

Now that the romance rumors between the two have been going on for nearly two months, things seem to be heating up and getting serious, as they've now gone on vacation together. The 31-year-old singer and the 39-year-old actor were spotting holding hands while hiking in Hawaii this past weekend.

"They looked very loved up and really into each other," a source told Entertainment Tonight. "They were comfortable letting everyone see them as a couple -- lots of PDA and hand-holding. It seemed very romantic and they both smiled a lot, and looked to really enjoy each other's company."

They spent several days together in a private house while on vacation and continued to partake in different activities, including a helicopter ride and dinner at Bar Acuda restaurant.

While the photos speak for themselves, other sources have revealed to multiple publications that there's definitely something "serious" going on here.

"Orlando and Katy seem very serious," a source told People. "They have a give-and-take relationship. Katy hasn't looked happier. She always has the biggest smile while she is around Orlando."

"Katy likes how down to earth Orlando is," another source told E! News. "They seem to be getting serious and are an official couple. She calls him her boyfriend."

Since the two got back from their romantic getaway, they have been staying with each other in New York City and were even just out on a date at The Polo Bar in Midtown on Tuesday.

"It looked like Katy was very comfortable being herself in front of Orlando. They were sitting close to each other, [and] Orlando was a gentleman," an onlooker shared. "Katy was smiling during their dinner and Orlando could not keep his eyes off her while they were eating. The way it looked seemed like they been dating each other for sometime now. They were very relaxed."