Andrew W.K. Shows Off Gold Band in Cozy Post for Love Kat Dennings' 35th Birthday

Kat Dennings Instagram

Andrew W.K. is wishing Kat Dennings a very happy birthday - while showing off an eye-catching piece of jewelry.

"HAPPY BIRTHDAY, @katdenningsss!!!" W.K. 42, captioned a cozy Instagram photo of the couple, in which a gold band is prominently on display on his ring finger.

"I love you so much," commented Dennings, who turned 35 on Sunday. The Dollface star also reposted the photo on her own Instagram account, calling W.K. "the real [gift]" in her caption.

The Sunday snap wasn't the first time W.K. appeared to flash the gold band. Since announcing their engagement last month, the actress and the artist have been spotted on social media wearing additional rings.

RELATED: The Cutest Photos of Kat Dennings with Her Fiancé Andrew W.K.

On May 23, W.K. shared a photo of himself posing in front of a pink piano, wearing what appears to be the same gold band on his finger.

A week later, Dennings shared a photo of herself snuggling with her cat while showing off her engagement ring and what appears to be an additional diamond band.

On both posts, fans speculated that the two had already tied the knot. One Instagram user commented on the singer's piano photo and wrote, "uhm guess he already married kat? ya'll see the ring?" Another commented on Dennings' post with her cat to ask if she was "officially married."

Reps for Dennings and W.K. have not responded to PEOPLE's requests for comment.

In her May engagement post, Dennings shared three photos of the couple, two of which showed off her massive diamond ring. "Don't mind if I do," she captioned the slideshow.

Her fiancé - born Andrew Fetterly Wilkes-Krier - shared the same three photos on his Instagram page, captioning his post with a diamond ring emoji.

RELATED: Kat Dennings Is Engaged! Actress Shows Off Her Diamond Ring from Fiancé Andrew W.K.

Days before announcing their engagement, Dennings wished the musician a happy 42nd birthday, posting a photo of the two kissing.

On May 3, she made their romance Instagram official when she shared two sultry photos of the rocker with a heart emoji on Instagram.

Dennings previously dated musician Josh Groban; the two called it quits in 2016 after two years together.

W.K. married Cherie Lily in 2008. The two "began amicable divorce proceedings in late 2019," according to a previous press release from W.K.