Luke Littler's girlfriend congratulated him on social media after he hit a nine-darter on his way to winning the Belgian Darts Open on Sunday.
Littler won a thrilling final in the deciding leg against Cross to pick up his third tournament win since turning professional.
The 17-year-old has taken the darts world by storm in recent months after his record-breaking run at the World Championship at Alexandra Palace.
He has won the Bahrain Masters and a Players Championship event, as well as having a solid start in the Premier League.
Luke Littler hit a nine-darter and won the Belgian Darts Open on Sunday
PDC/Instagram
Littler hit a nine-darter in both of those tournament victories and continued that trend at the weekend.
He celebrated wildly after smashing in a perfect leg to take a 6-5 lead over Cross.
Cross won the next two legs to put himself on the brink of victory before Littler stormed back to clinch the title.
Littler has been dating Eloise Milburn since before the World Championship last year and she regularly posts about her boyfriend on Instagram.
Milburn watched on from home as Littler raced to another tournament win.
And afterwards, she wrote on her Instagram story: "A 9 darter and Euro tour champion on debut! Could not be prouder of you! Love you!"
Littler responded to the post with two love heart emojis.
She also commented on one of Littler's posts, writing: "You are incredible."
Littler had won five matches before reaching Sunday's final, beating Jose de Sousa in the first round on Friday before overcoming Krzysztof Ratajski on Saturday.
He beat Damon Heta in the third round on Sunday before depositing Jermaine Wattimena in the quarter-final.
Littler beat Germany's Ricardo Pietreczko in the semi-final to set up the clash with Premier League rival Cross.
After his quarter-final win, Littler admitted he didn't practice much as he was watching the huge football match between Liverpool and Manchester City.
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Luke Littler's girlfriend posted a message after he won the Belgian Darts Open
He said: "I only had 20 minutes practice because I was watching the football!
"Everything went well and when Jermaine put me under pressure, that's when I hit my doubles.
"If you didn't see it, I tried to slow myself down taking a drink and tried not to get over-fast, compose myself and that's what I've done."
Littler was delighted to beat Cross and says a nine-darter adds gloss to the win.
Luke Littler has now won three tournaments as a professional darts player
PDC
He said: "I'm just glad to get over the line. I lost the two legs after I hit the nine so I'm relieved to get the win.
"It's always good to be involved in a good game; me and Rob have battles and we bring the best out of each other.
"I'm really happy to hit a nine-darter, I prefer 144 to 141 to finish a nine because when the first treble 20 goes in I'm confident of following it with another.
"I know the spotlight is on me because I've done so well but I just play my darts and get on with it. I just do what I do."
