Kylie Minogue, 41, slapped Spanish model Andres Velencoso in the face during an argument outside the B Bar, in New York, earlier this week.
An onlooker said: "At some point, Kylie and Andres got separated. When Kylie found him, she slapped him in the face with a fan. Then she yelled at him for making her wait outside while he stayed inside and got another drink."
Despite their heated bust-up, the couple are expected to confirm their engagement soon.
The 'Wow' singer is even converting to Catholicism so she can have a traditional church wedding to Andres, 31, who she has dated since last November.
A source said: "She enjoyed the sense of community Andres' family share thanks to their faith. Kylie is so intent on including the traditional aspects of a Catholic mass that she's thinking of converting."
Kylie and Andres are planning to tie the knot in Spain at the Parador de Cardona, a 9th century castle on the Costa Brava.
The couple were seen last month shopping for a villa in Tossa de Mar, Andres' hometown. It is the first time Kylie - who has previously been in relationships with actor Olivier Martinez and late INXS frontman Michael Hutchence - has committed to buying a property with a boyfriend.
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