Leonardo DiCaprio and Camila Morrone are pros at keeping their relationship hidden from public scrutiny; the two were first spotted together in 2017, but other than DiCaprio's uncanny ability to turn into viral memes (open in new tab) and an eyebrow-raising age difference (the actor is 23 years older than his supermodel/actress girlfriend, who is now 23), little else was known about their romance. So how exactly did this relationship blossom?

Here, we track everything you need to know about one of Hollywood's most elusive couples.

According to E. News (opens in new tab), DiCaprio and Morrone are in it for the long haul.

"Leo and Cami are still going strong and doing really well. He is very cozy with Cami and they are serious," a source told the outlet about how the couple has been spending their time inside 2020.

"He's filming right now, but Leo is settling into a family life with Cami. He really likes living with her and they are much more like a couple than they used to be."

DiCaprio and Morrone were photographed leaving Nobu (open in new tab), their favorite sushi spot in Los Angeles, on Monday, June 29. Morrone wore an oversized olive bomber jacket, torn black denim, and red Converse sneakers, while DiCaprio was completely hidden from the paparazzi in a matching green hoodie. Both men wore face masks, as Los Angeles is currently experiencing a surge in COVID-19 cases.

"Page Six" (opens in new tab) reported that Morrone celebrated her 23rd birthday with a yacht party. According to the magazine, guests included Nina Dobrev and her rumored boyfriend Shaun White (opens in new tab).

According to Page Six, "the invited guests were dressed in cowboy hats and Western clothing," and DiCaprio was the only guest spotted wearing a mask.

DiCaprio and Morrone did not walk the red carpet together, but they arrived a few minutes apart, suggesting they came at the same time. The two were also seated next to each other during the awards ceremony (opens in new tab).

This was the first time the two appeared at the same event this awards season.

In an interview with the Los Angeles Times (opens in new tab), the young actress was not afraid to speak candidly about her age difference with her boyfriend.

"In Hollywood and in the history of the world, there are a lot of relationships with age differences. I just think everyone should be able to date who they want to date," she said, sympathizing with those who naturally pry about their relationship." I would probably be curious too."

The Internet quickly made the scene viral (opens in new tab) after dad took a photo of Morrone posing repeatedly for DiCaprio's Instagram-worthy look.

According to Vanity Fair magazine (opens in new tab), Morrone lamented the fate of this viral meme.

"I saw the meme," she said. 'Poor guy, they call him the Instagram boyfriend. He's an environmentalist and a movie star and it means nothing."

Morrone, who posted a photo of Hollywood couple Lauren Bacall and Humphrey Bogart, who are 25 years apart, captioned the flick simply, "Such love."

People quickly assumed she was referring to the large age difference between her and DiCaprio.

She later wrote to critics (opens in new tab) on her Instagram story. I hope this Friday people learn to live with a little less hate and put their time and interests elsewhere because it feels so good to live without hate."

She added, "I'm not sure I'll ever be able to live without hate again.

It was at this coveted film festival that DiCaprio became a viral meme (open in new tab).

DiCaprio and Morrone attended the three-day music festival together and casually exchanged PAs, according to photos published in the Daily Mail (opens new tab).

DiCaprio and Morrone attended the three-day music festival together and even casually exchanged PDA, according to photos published in the Daily Mail (opens in new tab).

The two sat next to each other during a UEFA Champions League Group C match in Paris.

That same month, E. (opens in new tab) reported that their relationship was getting serious. 'It's getting more serious,' one insider said. 'They have been inseparable for the last year and are crazy about each other. They have gotten to know each other's families and love being together."

Another source added, "He is very serious about Camilla and has been for some time now, but marriage is not on the horizon."

A source for Us Weekly (open in new tab) refuted E.'s source, saying that the two have already heard wedding bells." They are talking about getting engaged," the source said, adding that the Academy Award-winning actor is "ready to have kids."

Photos released by "E." (open in new tab) show the two snorkeling and boating together while on vacation in Europe.

"Leo and Camilla enjoy boating in the sun, snorkeling, and getting in the water. They have dined on the yacht several times, but have anchored several times and gotten off to see the sights and enjoy the best of the place," a source told the outlet. 'They visited Capri and had a lovely lunch at Il Riccio overlooking the sea. They come back to the yacht in a small boat."

During a casual outing in Los Angeles (open in new tab), Morrone held her boyfriend's arm in a rare display of PDA.

A month after they were first spotted together, the couple vacationed together in Aspen; according to People (open in new tab), fellow actor and friend Tobey Maguire was also present with their two children.

A report in Us Weekly (opens in new tab) revealed that the two were "dating." The rumor came months after DiCaprio's split from model Nina Agdal.