Darren Criss' Blaine Anderson and Chris Colfer's Kurt Hummel are preparing to celebrate their first anniversary on the Fox musical-comedy Glee.

Kurt and Blaine began dating during the show's second season. Before getting the guy, Kurt endured Blaine serenading a GAP employee on Valentine's Day and constant bullying from closeted student Dave Karofsky (played by Max Adler).

This year, their budding romance was taken to the next level in the recent episode titled The First Time. The couple's decision to get physical was prompted by the arrival of Sebastian (played by newcomer Grant Gustin), a scheming Dalton Academy Warbler who aggressively pursued Blaine.

Despite the rocky road to romance, Kurt and Blaine, dubbed Klaine, have survived their first year together.

On Thursday, a tweet from Lea Michele, who plays Broadway-bound diva Rachel Berry on the show, left little doubt that producers were preparing to highlight the couple's anniversary.

β€œIt would only be fitting for Kurt to be singing a love song to Blaine today:) @chriscolfer @DarrenCriss congrats! #1yearofKaline,” Michele messaged.

Glee is currently filming its last five episodes of the season.