Source: Jake Gyllenhaal on "Cloud Nine" Over Taylor Swift, Planning Rendezvous in Paris

Reports indicate that Taylor Swift is more serious about her career than Jake Gyllenhaal.

But the same can't be said about the actor's feelings regarding this young singer. According to Hollywood Life sources, Jake has dated since his split with Reese Witherspoon, but "no one has put a smile on his face like Taylor. He’s really on cloud nine."

Call them Swiftenhaal or Gyllenwift. Just don't call Taylor and Jake a casual couple any longer.

Following casual dates in NYC and California, things between Swiftenhaal will allegedly heat up this December, as insiders claim: “The two are planning to spend the holidays together. And Jake plans to meet Taylor in Paris at the beginning of the new year, where she’ll be performing.”

How did these two even cross paths?

Maggie Gyllenhaal supposedly met Swift at a charity event and thought she was a "sweet girl with a good head on her shoulders." She told her brother the same.

But might she have walked her sibling into a trap? Will Swift soon pen a revenge song titled "Dear Jake?" Unlikely, a source says.

“He’s not like the other men Taylor has dated. Jake is no John Mayer. He’s a very sweet and sensitive guy. He treats women with respect.”