HBO's hit series Big Little Lies has added yet another Oscar winner to its cast, with Meryl Streep coming aboard for the second season. The actress, who just scored her record-breaking 21st Oscar nomination yesterday, will come aboard to play Mary Louise Wright, the mother of Perry Wright, played by Alexander Skarsgard, who won a Golden Globe for his performance in the first season. If you aren't caught up with the series yet, there will be SPOILERS below, so read on at your own risk.

It was revealed at the end of the first season, which is based on the novel of the same name by Liane Moriarty, that Perry Wright is the person who died, although Alexander Skarsgard has been confirmed to return in some capacity for the second season of the HBO series. Meryl Streep's Mary Louise Wright is said to be concerned for the well-being of her grandchildren after the death of her son, and she arrives in Monterey looking for answers. Interestingly enough, series creator David E. Kelley revealed in an October interview that his "dream casting goal" was to bring on both Meryl Streep and Tom Hanks to Big Little Lies, so we'll have to see if he can lock down Tom Hanks as well.

The first season debuted in February 2017, with its seven-episode run concluding in April 2017, and while it was certainly a critically-acclaimed show, HBO didn't officially announce a Season 2 renewal until just last month. Series stars Reese Witherspoon and Nicole Kidman have been confirmed to return, with others like Shailene Woodley, Zoe Kravitz, Laura Dern and Adam Scott expressing interest in returning. The new season will be directed by Andrea Arnold (American Honey), with sources claiming that the search for a director was one of the main reasons the show's renewal was delayed. Jean-Marc Vallee directed all seven episodes of the first season.

Related: Big Little Lies Renewed for Season 2, Witherspoon & Kidman Will Return

Season 2 was officially renewed for a seven-episode run, but it was also confirmed that the show will not return until 2019, with the show stretching beyond the original novel by Liane Moriarty. Sources claim that the season will also introduce the parents of Bonnie Carlson, played by Zoe Kravitz, although it hasn't been revealed who will play those characters quite yet. Deals with the rest of the cast from Season 1 are still being worked out, which is why only Reese Witherspoon and Nicole Kidman have been confirmed thus far. Sources claim that all of the cast members got sizable pay increases after Reese Witherspoon signed a huge deal for her new Apple series with Jennifer Aniston.

Big Little Lies was the top TV winner at the Golden Globes earlier this month, winning Best Limited Series, Best Performance by an Actress in a Supporting Role (Laura Dern), Best Performance by an Actor in a Supporting Role (Alexander Skarsgård) and Best Performance by an Actress in a Limited Series (Nicole Kidman). Series creator David E. Kelley is also returning, and he has already written all seven of the Season 2 scripts. He will executive produce alongside Nicole Kidman, her Blossom Films head Per Saari, Reese Witherspoon with her Hello Sunshine partner Bruna Papandrea, Andrea Arnold, Jean-Marc Vallée, Nathan Ross and Gregg Fienberg, with author Liane Moriarty serving as a producer. The Hollywood Reporter broke the news about Meryl Streep's casting earlier today.