(Photo by Vittorio Zunino Celotto/Getty Images for Kering)

Joshua Jackson and Lupita Nyong'o has officially declared their romance!

About five months after igniting speculation about their romance, the former 'Dawson's Creek' star and Nyong'o showcased their affectionate connection during the 'Black Panther's' actress' birthday weekend in Puerto Vallarta, Mexico. Nyong'o, 41, dressed in a patterned bikini, while Jackson, sporting dark swimming trunks, were seen holding hands during a romantic beach stroll on Sunday.

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According to reports, the 45-year-old actor marked Nyong'o's bornday by arranging a charming presentation of balloons and a bouquet of flowers in their hotel suite.

"They looked madly in love," an eyewitness purportedly stated to E!. "They just couldn't get enough of one another."

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Rumors about Jackson and Nyong'o dating began circulating in late October after their appearance at Janelle Monae's Los Angeles concert. They both recently ended relationships.

(Photo by Amy Sussman/Getty Images for Deadline Hollywood)

Jodie Turner-Smith, who has a 3-year-old daughter with Jackson, submitted a divorce petition on Oct. 2, citing irreconcilable differences as the grounds for terminating their four-year marriage. According to court records obtained by E! News, she specified Sep. 13 as the official date of their separation.

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 (Photo by MICHAEL TRAN/AFP via Getty Images)

Nyong'o announced the end of her relationship with former boyfriend Selema Masekea, coinciding with the circulation of online images featuring her and Jackson at the Monáe concert. 

"It is necessary for me to share a personal truth and publicly dissociate myself from someone I can no longer trust," she wrote on Instagram. "I find myself in a season of heartbreak because of a love suddenly and devastatingly extinguished by deception."