After that union broke down in just over a month - with Miley citing 'commitment issues' as the cause - she moved on with another former friend, Cody.
Despite the hasty nature of their relationship - the pair have reportedly already moved in together - and Angie Simpson has given her seal of approval.
Taking to Instagram, Angie posted a selfie of her son and the Grammy-nominated artist, along with the caption: "Puts a smile on my dial to see you both so blissfully happy 😃
"Hearing your laughs and seeing the smiles on your faces lights up my heart 💫."
The loving feelings are clearly reciprocated, as the Bangerz singer left a series of love heart emojis on Angie's post.
Meanwhile, Miley's mum Tish was also thrilled with the new relationship, writing on Angie's post: "Puts a smile on my face too @angiemsimpson love you my sweet friend 💗."
Despite flaunting two new lovers since the collapse of her marriage to Liam, new reports are suggesting that Miley isn't coping well with her ex's new relationship with Australian actress Maddison Brown.
According to reports, the former Disney star has been a mess since Liam was seen with the Dynasty beauty, 22, in New York City.
And it seems the news of his former wife's heartbreak isn't weighing on his mind too much.
"They say revenge is sweet," a source told In Touch magazine. "Liam is totally over Miley and the drama and is in a really great place."
But Miley isn’t as thrilled by the turn of events, says the publication’s source.
"She never expected Liam to move on so quickly and has been behaving like a jealous brat since finding out about Maddison," says the insider.
"To the outside world, she’ll act like she doesn’t care. But behind closed doors, she’s fuming and spiralling."