Amelia Hamlin was gifted a diamond necklace by Scott Disick for her 20th birthday

In one snap, uploaded to Instagram, Amelia looked thrilled as Scott put the necklace on her.

And earlier in the week, Amelia revealed she was treated to a birthday surprise.

Writing on her Instagram story, she shared: "Today my best friends and ppl I love the most surprised me with an early birthday and it was a dream come true."

Meanwhile, Amelia previously praised Scott for "lighting up" her life as she marked his birthday.

Writing on Instagram, she shared: "happy birthday my love. you light up my life, and make my world better. i can’t imagine what i would do without you. thank you for being you. the most caring, loving, special person on this planet. i’m so lucky. i’m so blessed to have met you. i love you (sic)"

Scott is still close to ex Kourtney Kardashian, with whom he shares Mason, 11, Penelope, eight, Reign, six, but Amelia doesn't mind their friendship.

A source said of the exes: "Amelia's not bothered by Kourtney. Scott and Amelia have been enjoying spending a lot of time together and hanging out with their friends. Their relationship has been heating up and you can totally tell they’re serious. Scott’s relationship with Amelia is different from his last in that he’s spending more time with Amelia and not Kourtney. Sofia [Richie] got jealous of his relationship with Kourtney and this time around it’s not an issue."