Warner Bros.' Joker: Folie a Deux, a dark new musical Batman spinoff, earned an estimated $40 million over the weekend to top the North American box office, industry watchers reported Sunday.

Joker: Folie a Deux tops North America box office amid mixed reviews

Joker and Harley Quin suited up for this one. Actors Joaquin Phoenix and Lady Gaga appeared on the red carpet in London on Wednesday night for the UK premiere of Joker: Folie A Deux.

Lady Gaga and Joaquin Phoenix glam up for K premiere of Joker: Folie A Deux, see pics

Director Tod Philips treated fans on Valentine's Day to new stills from the upcoming film Joker: Folie à Deux featuring Joaquin Phoenix and Lady Gaga. Philips gave a sneak peek into their characters in the highly anticipated sequel of Joker- much to the delight of the fans.

Joker: Folie à Deux: Todd Philips treats fans to new pics of Joaquin Phoenix, Lady Gaga on Valentine's Day

After Todd Philips’ ‘Joker’ became the most critically acclaimed film of the year and highest-grossing R-rated film of all time with more than $1 billion in the box office, there are talks for a sequel.

Todd Philips, Joaquin Phoenix likely to reunite for 'Joker' sequel

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Joker: Folie a Deux tops North America box office amid mixed reviews

Lady Gaga and Joaquin Phoenix glam up for K premiere of Joker: Folie A Deux, see pics

Joker: Folie à Deux: Todd Philips treats fans to new pics of Joaquin Phoenix, Lady Gaga on Valentine's Day

Todd Philips, Joaquin Phoenix likely to reunite for 'Joker' sequel