Gwen Stefani sparked rumors that she may be on honeymoon with Blake Shelton after she posted a message on Twitter Monday night about the strawberry moon. The couple has been surrounded with several marriage and engagement rumors since they made their relationship public last year.

"Hi strawberry moon #honeymoon #rosemoon gx #Oklahoma 2016," Stefani wrote on her Twitter account. A full moon in the sky during the month of June is called a strawberry moon. This year, the strawberry moon was special as it coincided with the summer solstice.

Just after the "Hollaback Girl" singer posted the message, several of her fans speculated about her honeymoon in Oklahoma.

“Congrats to you and Blake on your marriage! Your happiness brings joy to so many,” one fan wrote in response to Gwen’s tweet, while another wrote: “Honeymoon? Please tell me y’all secretly got married (or at least engaged)."

Stefani showed off major PDA for her boyfriend during a concert in Colorado over the weekend. Shelton got a big kiss for his 40th birthday from his girlfriend after a performance during his concert, Us Weekly magazine reported. Stefani’s unexpected kiss flustered Shelton as he told the crowd: "What just happened?! I don’t know how I’m going to follow that."

Over the last few months, several reports have claimed that Stefani and Shelton are all set to start a family. Reports about Stefani's pregnancy surfaced with some claiming she was having twins. Apart from pregnancy rumors, reports about her “secret” wedding to Shelton in Oklahoma also made the rounds.