Blac Chyna accused Rob Kardashian of ''texting b****es'' in an explosive argument.

The 28-year-old beauty was seen screaming at her sock designer fiance in the first trailer for the couple's upcoming reality series 'Rob & Chyna' in an apparent row over his commitment to her.

In the clip, she screamed down the phone: ''Are you still texting b****es, yes or no?''

She then threw a bunch of flowers into a pool.

Elsewhere in the 30-second trailer, Rob, 39, praised his fiancee - who is pregnant with his first child - as ''good'' and ''loyal''.

He told her: ''I fell in love with you because I know how good you are and how loyal you are.''

The clip also showed Rob working out, being affectionate towards Chyna - who also has three-year-old son King Cairo with ex-boyfriend Tyga and planting a kiss on her bare baby bump.

As he kissed her growing tummy, she asked: ''Are you ready to be a daddy?''

Rob replied: ''That's what I always wanted.''

The former 'Keeping Up With the Kardashians' star's older sister, Khloé Kardashian, 32, also featured in the trailer as she pondered her brother's transformation.

She said: ''That Rob wants to be so public blows my mind.''

The clip ended with the tagline: ''They're cute, they're complicated and they're about to become family.''

It was recently claimed that a large part of the show focus on the couple's arguments.

Production sources revealed they fight over a variety of issues, from Rob's weight, to posts on social media, to money and fame, and very few things are not filmed.

And the tension between them has only been exacerbated by Chyna's pregnancy.

The pair are being filmed five days a week, for up to 13 hours a day.

'Rob & Chyna' - which is six hour-long episodes - premieres on E! on September 11.