Marisa Ramirez's birthday tribute to Donnie Wahlberg sparked fan speculation after the Blue Bloods star wrote "See you soon."

The spinoff, premiering October 11 on CBS, follows Wahlberg's character Danny Reagan as he starts a new chapter in Boston with a new partner.

Marisa and Donnie's off-screen friendship and strong on-screen chemistry have fueled fans' hopes for a Baez and Danny romance in the spinoff.

"Happy Birthday!!! To my best girlfriend 😂" may not be the message you'd expect between two veteran TV detectives, but that's exactly how Blue Bloods star Marisa Ramirez chose to kick off her birthday tribute to co-star Donnie Wahlberg .

The New Kids on the Block member turned 56 on August 17 and got all the birthday love on Instagram when his co-star posted a smiling selfie o

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