The 32-year-old scored a beauty to make it 3-0 to the Seagulls in a demolition job at the Amex Stadium on Saturday as Jurgen Klopp's woes mount up.
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And the former Manchester United star celebrated by pointing to his head - a motion that has been popularised by Rashford recently amid his goal-scoring streak.
Welbeck took to Instagram to post his celebration while also tagging his old Red Devils pal with a hand-shaking emoji, to which Rashford replied with a simple love heart emoji.
It follows the England international's goal against Manchester City, netting the winner on Saturday lunch-time to see the club go one point behind their rivals.
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Rashford went on to perform his celebration after his late goal against City and it has been theorised that it symbolises his mental well-being.
The 25-year-old has admitted he struggled last season after netting just five Premier League goals but is in the form of his life at the moment.
His strike against City was the ninth home game in a row that he has got on the scoresheet, taking his total tally to 16 this campaign.
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Though it might have been different had the forward come off after suffering an injury towards the end of the first-half but he persevered and ended up playing a crucial role while manager Erik ten Hag was full of praise for the Englishman.
"I don't think I said he had to learn to deal with it, but he has; he knows how to deal; he knows that in top football you have to suffer, sacrifice, and have painful moments," the United coach said.
"Especially a player like he is, he's unstoppable, opponents will go tough against him to stop him. But you have to deal with it, and I think he's capable of it.
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"He keeps investing, he keeps going, he keeps focusing for his chances and in the end he got a reward and the team got his reward."
Meanwhile, Brighton continue to go from strength to strength and are in the running for a European finish this year under Roberto de Zerbi.
The south-coast side are currently seventh and are two points behind sixth-placed Fulham, who are also experiencing a fine season.