The sisters were spotted indulging in a bit of retail therapy in Los Angeles this week in a bid to cheer up newly-single Tamara.
The 28-year-old brunette flew out to LA to be with her sister after she split with her boyfriend Omar Khyami, who was linked to another woman.
The pair, who arrived in a pink Rolls Royce, were joined on the shopping trip by Petra's husband James Stunt.
Tamara has spoken in the past about how close she is to her 23-year-old sister.
"We're very different but she's the person I trust the most in the world," said Tamara, who has Petra's initial tattooed on the inside of her wrist.
Two weeks have gone by since the pretty brunette called time on her relationship with Omar, 38 – a businessman whose family originally hail from Syria.
"People never fail to disappoint me but I really hope what comes around goes around."
In the past, Tamara had spoken of marrying Omar, saying: "Deep down you know when someone loves you for who you are and not what you have.
"I think I’m a good judge of character. Omar and I definitely want to get married. I think in the next few years hopefully we will tie the knot."
The couple were even set to move into a 55-room, £45 million Kensington mansion that they spent a further £18 million renovating.