Un plus une ("One plus one", with the 'one's being grammatically masculine and feminine respectively) is a 2015 French romantic comedy film directed by Claude Lelouch and starring Jean Dujardin, Elsa Zylberstein, Christopher Lambert, and Alice Pol.

[3] Through a range of settings, such as a striking sequence filmed at the banks of the Ganges, the leads convey their characters’ friendship and romantic attraction.

The pair become friends and she talks a lot about spiriturality including the miraculous events surrounding Amma, the "hugging saint", despite describing Antoine as a pragmatist who is not open to the supernatural.

As they travel south to Amritapuri, to receive an embrace from Amma, Antoine says she has been sending her signals of a sexual nature, especially bathing in the Ganges in a blouse that became transparent, but she insists that was a spiritual cleansing only and the pair agree they are just friends.

Other conversations include flashback stories of meeting their current partners (Antoine met Alice when she was playing piano on the street.

He lies saying that the piano playing in the background is the tuner when in fact it is Alice who has spent the night with Samuel.

The four meet at the airport and the ambassador says that being unable to reach Anna on her phone, or on the hotel phone, he was worried and called Alice early in the morning, and, being so upset, he kissed her and they embraced for a long time (implying they had sex), saying it was proper for them to tell their respective partners and implying he knows Antoine and Anna have been unfaithful.

Anna goes to her parents' long boat (passing signage advertising Alice as a soloist pianist) and Antoine's father stops their car at the same place.

In a post credits scene, Anna and Antoine are seen dancing together in India dressed in Indian style as bride and groom.

Principal photography began on 6 January 2015 and took place over a period of six weeks in India, in Mumbai, Varanasi, and New Delhi.