The Wrecking Ball singer and 22-year-old Patrick split last year (15) after a five-month romance, but the action man proved to his fans the break was amicable by posting a video of himself with his son's former flame on Snapchat.

Miley, who is back together with ex-fiance Liam Hemsworth, ran into Arnold while attending American network NBCUniversal's Upfront Presentation of new TV shows. He shot a quick clip with her at the event, praising the star by saying, "I'm here with a great, great entertainer, one of the greatest in the world. Look at how beautiful and talented she is! Eat your heart out!", to which Miley quipped, "Yeah! Eat your heart out."

Arnold was on hand to promote his new gig as host of business competition show Celebrity Apprentice. He is stepping into the top position to replace fellow Republican Donald Trump, who had to give up the job when he announced he was running for president last summer (16).

Meanwhile, Miley was on hand to give potential TV advertisers a preview of her new job as mentor and coach on singing competition The Voice.

She and R&B star Alicia Keys are the newcomers on the panel, which also consists of veteran judges Adam Levine and Blake Shelton.

While on stage at New York's famed Radio City Music Hall, Miley suggested the audience members were "all a little drunk", before quipping, "That’s OK, so are we."

Miley and Alicia will make their debuts on The Voice when season 11 of the show kicks off this autumn (16).