"Rumor Has It" that Adele and Sarah Palin are fast becoming BFFs.

The singer told a UK TV show on Friday night that her success in the U.S. was thanks to the former Alaska governor. Palin responded by giving her a copy of her new book, "Sweet Freedom," with a sweet message inside.

She loaded the note with references to several of Adele's songs:

Adele appeared alongside the former vice presidential candidate on "Saturday Night Live " in 2008. The Grammy-winning singer, whose new album "25" dropped Friday, said Palin's appearance garnered a massive audience for her performance.

"Because something came up in the campaign, she came and did the week I was doing it with Josh Brolin," she said on the "Adele At The BBC" special, hosted by Graham Norton.