Hilary Duff and Matthew Koma back together - report

Hilary Duff and music producer Matthew Koma have reportedly rekindled their relationship.

The Lizzie McGuire star began dating Matthew last year (16), shortly after her romance with her personal trainer Jason Walsh fizzled out in November (16), but she parted ways with the hitmaker in April (17).

She was seen embracing businessman Ely Sandvik in July (17), sparking rumors of a summer romance, but it now appears she has found love with Matthew again, according to E! News.

Hilary celebrated her 30th birthday on 28 September (17) and Koma is featured in the pictures from her party. Matthew also posted a picture of the pair looking lovingly at each other on his Instagram page.

"#tBt (throwback Thursday) birthday girl," he captioned the picture.

According to a source, the couple has been back together since his tour ended.

"Since Matt got back from tour, they've been seeing each other again," a source told the website. "Him being gone on tour was the main reason things didn't work out the first time around, so now that he's back they picked up right where they left off."

"He took her on a romantic dinner date for her birthday, bought her a guitar, and was at her 30th birthday party," another source added. "Her friends and family really adore Matthew. Hilary also wants to get in the studio with Matthew and they have had a working relationship."

Hilary and Matthew have not commented on the status of their relationship.

The singer and actress split from Mike Comrie, the father of her four-year-old son Luca, in 2014, after three years of marriage. They finalized their divorce in February, 2016, but remain close friends.